As wallcraft said the rough approximate figure is 500 cycles. So if it is charged every day that would be less than 2 years. However, batteries like to be charged before 0%. So if you charged it around 50% or 40% say twice every day, it may keep going for well over 1000 cycles and you could get over 2 years, despite being charged more often.
Although it is a different chemistry, I read reports from RC people testing new A123 cells using very high loads (model airplanes) having 80% of the original capacity left after 1000 cycles!!! I am not familiar with this type though. In any case the point is they could last a long time.
Just avoid going down to 0% (min 30% would be ideal) and you don't even have to charge it to full. Most hybrid/EV cars that are pushing for maxmum lifespan use 30%-80% range. Sure, they only use half the capacity but get amazing lifespan, thousands of cycles.
In practice it means you don't have to wait for 0% before charging and don't have to wait for 100% before removing from charge. Not sure if DR can display % charge as opposed to simply bars that are not very informative.
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