Yeah. I worked 30 hours/week when I went to undergrad full time for CS. Later I went back to grad school while also working full time. There is a lot of free time in many people's day. I'm also not saying it all has to be productive, I know mine certainly isn't, but it should be deliberate. I love sitting down to watch a movie or play a game, and I hate when I get sucked into some social media for 30 mins or an hour without realizing it.