Could I use my Pre-Existing Computer to mine bitcoin?

Ok, so I think I understand how the bitcoin mining generally works and I think my computer could make profit of it. The only thing is that I would like to still play games and having mining load while gaming would be a problem. Here are my questions;

Does bitcoin mining have to be on all the time?

Also how would I figure out hashing power and power consumption for the bitcoin Calculator?

Would my graphics card be good enough to make long term profit?

Submitted July 04, 2017 at 09:59AM by gogoriki420
via reddit