GPU requirements to mine

How many GPUs would be required to mine Crypto such as Bitcoin or the likes? I've heard that it takes up a lot of your computing power, but I don't know how much.

it depends on witch cards are you going with, well mining in 2019 it's useless btw

Dude forget mining you're a bit late if i might say

its about 5 years to late to mine im afraid. The cost of electric vs the return is not even close to worth it.