> How long will those tactile buttons last

Button manufacturers rate their products for this kind of thing. ie. "10k cycles" (not that high), "1M cycles" (better), etc.

So it really depends upon the device manufacturer to pick something appropriate.

Random examples:

• https://uk.rs-online.com/web/p/push-button-switches/1336473

Datasheet for that has 10k cycles: https://docs.rs-online.com/512f/0900766b8137f3b1.pdf

• https://uk.rs-online.com/web/p/push-button-switches/1759621

Datasheet for that lists 1M cycles: https://docs.rs-online.com/4ef8/0900766b81680212.pdf