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I've been using a water heater timer for over 30 years now. It is for a 240 VAC water heater. It has one hour resolution. I haven't seen any 240 VAC timers with less than 1 hour resolution. I have a 120 VAC timer I used for other stuff that has 0.5 hour resolution.
I initially set it for one hour in the morning for my shower before going to work and one hour in the evening for doing dishes. But I found I usually had enough residual hot water left in the evening after my morning shower that I stopped turning it on in the evening.
Since I retired, I stopped using the timer and just turn the hot water heater on manually when I need it.
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