I estimate that I'm typically getting up to around 2 weeks regularly wearing the watch with:
which seems pretty reasonable. In practice since I use the watch as a daily driver I normally charge a bit more often than that to avoid the battery dying at a bad moment. Since the battery meter tends to hang out around 9–10% for a long time it's hard to be sure what the true max runtime would be without risking that; I consider that level as a sort of “charge as soon as possible” low-battery signal.
I do notice that long use of timers that update in 0.1-second intervals tend to drain the battery particularly rapidly. (At least one app seems to do such updates only when the screen is awake/unlocked and then cuts back to once per second, which seems like a good idea.) But occasional use of once-per-second displays for a few hours here and there doesn't seem to hurt overall runtime too badly.
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