It's tricky to give exact figures - the best thing to do is measure. I put a double-sided flexi PCB between the battery and the board, and measure the current draw.
Kingbright don't give lifetime info for their LEDs, but it's a lot. They're high quality and only run at 1-2mA so not stressed.
In terms of switch lifetime, it seems to be around 50,000 presses - so if you pressed it once a second for 24 hours a day then it might start to get a bit dodgy after 6 months.
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