My guess is that power reserve is the biggest issue. You're asking a lot of a single mainspring when the traditional power reserve for most chrono watches is sub 50 hours. Most all semi-affordable chronos are the same two movements, the 7750 and the st19, neither of which will do what you need. To go further in price you get to El Primero, which still doesn't. So...I think the probability that this exists is limited outside of ultra high end haute movements.

 

I find that confusing. Mechanical watches are powered either by winding or automatic movements- so power reserves would surely only be a problem if the watch weren't being worn, or wound, for 24 hours?
Secondly, and I should have made this clear in my post- I'm after a analogue chrono, but it doesn't have to be mechanical, a quartz movement is fine.

 

There’s tons of chronos with 12 hour subdials. Can’t you keep track from there?

 

I have seen 24 hour chronographs (for the time-telling only) but all have 12 hour registers for timing. There are 30 minute and 45 minute counters as well, but nothing exceeding 12 hour recording.

Thanks.

 

Said 24hr register.

 

tissot t touch solar pro (mine)

Casio Pro Trek (mine)

new tissot t touch solar connect (not mine, not my photo)

On all of these the chrono feature can be left 'on' which means it can be running and seen all of the time.
These have a countdown timer as well

 

I only know of one - the annoyingly discontinued Breitling Chronospace with an in-house superquartz movement, cal. B60. This really could have been the end-all be-all, but alas, this, along with a blackface version, was the only model ever released ...

 

The main reason to make 12h totalizers rather than 24h is legibility. Few people need a chronograph that counts more than 12h (most people don't even need that, see all the chronos without hour counter for reference), and the more sections you have around a small sub-dial, the harder they are to read. So for the great majority, an analog 12h chrono is more convenient than a 24h chrono.

 

Yes, this.

I would much rather have a 12hr counter vs 24hr for this reason alone. Also, its not like mechanical chronos stop counting when they reach their max time. Rather, they simply continue around the dial. So a 12hr counter should be sufficient to measure 24 hours... Unless, for example, the user could somehow be confused as to whether 18 hours had elapsed since timing started or only 6 hours. Which doesn't seem likely to me.

 

When I first read about chronographs many years ago, I came away with the impression that the classic chronograph had 3 sub dials measuring seconds, minutes, and hours, up to 24 hours.
Obviously there are many variations, with plenty of chronographs having sub dials for sub-seconds, seconds and minutes, only able to measure up to 1 hour total, or 30 minutes.
What seems very strange to me is that there seem to be NO chronographs available of the first type.
I've certainly spent many, many hours looking online for a chronograph [usually in the sub £500 range] that can measure up to 24 hours.
Now there are certainly lots that appear to be 24 hr, but, on closer inspection, the 3rd subdial does nothing more than state the current time in 24 hour format i.e. if the time on the main watch hands is 7.30 pm, the sub dial will say 19.30.
I've never found anything in the watch descriptions that actually state that distinction, but I can tell only because listed watches tend to be photographed with the hands set to either 10 to 2, or 10 past 10, and looking at the 3rd sub dial it always is in the 24 hour position of one of those.
My first question is why?? As someone with memory issues I make extensive use of stopwatch/countdown timer functions and find it frustrating that I can't find a chronograph that can measure up to 12 or 24 hours.
My second question is, does anyone know of a [preferably sub £500] chronograph that has 3 sub dials that can measure up to 24 hours?
Finally, presumably there is a official term for the kind of 24 hr chronograph I'm talking about- what is it? It would be very useful when trying to google search for such a watch.

[please note, I am fully aware that most dirt cheap quartz digitals have 24 hr stopwatches- I own a large number of casios, G-shocks etc, etc. I prefer the look and history of analogue watches, and currently when wearing an analogue watch on the left I also have a casio w202 on the right to take care of timing functions- it would be nice to get a proper 24hr analogue chronograph so I could get by with just one watch on my wrist]

see my post above

 

Aside from the power reserve issue, the other big reason is that anything timed over that long of a period doesn't need accuracy to the tenth of a second. The Ironman Triathlon World Championships, which are typically over 7 hours, only time things to the second.

 

EF527D-1AV | Silver Chronograph Men's Watch EDIFICE | CASIO

The Edifice EF-527D-1AV features a stainless steel case and band, 100-meter water resistance, EDIFICE logo stamped on the crown, back cover, and clasp.

www.casio.com

Here is a very reasonably priced quartz analog Casio that has 1/20 second resolution and records up to 12 hours. Not quite your 24 hours maximum but close.

 

Seiko also has several 1/20 second to 12 hour reasonably priced Chronographs. Take a look at the SNDD07, SND365PC and SND367PC models. The latter two are pretty minimal size 38mm diameter watches but are Japan models independently imported so do not have a Seiko USA warranty.

Amazon.com: Seiko import SND365PC dark blue mens SEIKO watch imports overseas models : Clothing, Shoes & Jewelry

Buy Seiko import SND365PC dark blue mens SEIKO watch imports overseas models and other Wrist Watches at Amazon.com. Our wide selection is eligible for free shipping and free returns.

www.amazon.com

Amazon.com: Seiko Men's SNDD07 Stainless Steel Bracelet Watch : Seiko: Clothing, Shoes & Jewelry

Buy Seiko Men's SNDD07 Stainless Steel Bracelet Watch and other Wrist Watches at Amazon.com. Our wide selection is eligible for free shipping and free returns.

www.amazon.com

 

When I first read about chronographs many years ago, I came away with the impression that the classic chronograph had 3 sub dials measuring seconds, minutes, and hours, up to 24 hours.
Obviously there are many variations, with plenty of chronographs having sub dials for sub-seconds, seconds and minutes, only able to measure up to 1 hour total, or 30 minutes.
What seems very strange to me is that there seem to be NO chronographs available of the first type.
I've certainly spent many, many hours looking online for a chronograph [usually in the sub £500 range] that can measure up to 24 hours.
Now there are certainly lots that appear to be 24 hr, but, on closer inspection, the 3rd subdial does nothing more than state the current time in 24 hour format i.e. if the time on the main watch hands is 7.30 pm, the sub dial will say 19.30.
I've never found anything in the watch descriptions that actually state that distinction, but I can tell only because listed watches tend to be photographed with the hands set to either 10 to 2, or 10 past 10, and looking at the 3rd sub dial it always is in the 24 hour position of one of those.
My first question is why?? As someone with memory issues I make extensive use of stopwatch/countdown timer functions and find it frustrating that I can't find a chronograph that can measure up to 12 or 24 hours.
My second question is, does anyone know of a [preferably sub £500] chronograph that has 3 sub dials that can measure up to 24 hours?
Finally, presumably there is a official term for the kind of 24 hr chronograph I'm talking about- what is it? It would be very useful when trying to google search for such a watch.

[please note, I am fully aware that most dirt cheap quartz digitals have 24 hr stopwatches- I own a large number of casios, G-shocks etc, etc. I prefer the look and history of analogue watches, and currently when wearing an analogue watch on the left I also have a casio w202 on the right to take care of timing functions- it would be nice to get a proper 24hr analogue chronograph so I could get by with just one watch on my wrist]

Gshock is a solid watch!

 

Seiko has a quartz analog that goes to 12 hours as does NFW and you mentioned the Casios. Many of the Digital G Shocks, and even less expensive models, go to 24 hours with a 1/100 second resolution and if that is not enough the GD350 Digital G Shock records up to 999 hours, 59 minutes and 59.99 seconds. That is just over 41.5 days, hopefully enough for almost anyone. Also the Casio GA100 series, Digital and Analog combination measures to 1/1000 second with a total range of 99 hours, 59 minutes and 59.999 seconds. As you stated a preference for analog hands the last one meets that requirement but with LCD digital chronograph, world time, timer and calendar info. A neat watch and under $100 for most versions on Amazon.

 

My JLC Extreme Lab 2 has a 24 hour Chronograph

Sent from my IN2017 using Tapatalk

 

I think a 7750 twelve hour chrono would do fine.
I'm sure you could tell if the measured event was fourteen hours or two.
A little bit of a difference there.