Does ‘hustle’ culture stop when you start working?

Different for everyone, because everyone has a different definition of "making it." It also comes in waves, to be completely honest. You "make it" and you're good for a bit, and then the hunger comes back and your definition of "making it" gets redefined so you grind again, mellow out, and the cycle repeats.

Don't feel guilty about time with friends and your girlfriend though. Come on, man. Maximize that time. You won't regret not spending an extra hour on some bullshit work that no one important is going to read anyhow. You'll regret not spending time with your boys or your girl. 

Don’t people these days just consume media through phones and tvs when we have downtime 

Once I started my big boy job out of college I realized how much i hated working for someone else and thats when my productivity outside of working hours actually increased, especially when you have access to capital to make investments

It sort of becomes like working out. At some point you change from someone who is working out to stay in shape, to someone who enjoys/needs it, to it being a fundamental part of who you are.

My first job was selling cars ata dealership. 
 

There I learned I had to hustle so I could make enough commission salary to cover rent expenses like my boss could with his comp. He was one of the top car dealers in the county