sure! but we talk about <50msec... even <20mSec. it's also depend what else your program is doing and how your program is done. Interrupt can happen really fast on some software.. slower on other. Always case by case.

PushButtons aren't 0-1 signal... still present some odd result when releasing them.

By software: We just check and insert a safe delay prior to return to the main program.

By using capacitor: it just smooth the signal when releasing the switch... the old CMOS-TTL-...-.... to do it. I prefer the software method in many case. No additional parts and even if you have the most crapy switch in the world, you just need to modify 1 code line OR constant variable. Handy with some tact switches brand...