system
A chat on subreddit /r/NoStupidQuestions
human
Even if someone has hobbies that take the same amount of time as gaming, they don't necessarily have any time that isn't currently allocated to something. "I have no time" can often mean "I have no time that isn't currently taken up by something I need to do/would rather do/have the energy to do over something else." 

Also, some people prefer to be able to take large blocks to play games and don't have those large time blocks open.
gpt
&gt;Also, some people prefer to be able to take large blocks to play games and don't have those large time blocks open. 

I used to just straight up not be able to play a game if I didn't know I had like 5 hours free to do it. I can't say for certain, but I'd guess it's related to ADHD "waiting mode."