I call it " It's the freakin' weekend time to have ME some FUN." which really just meens not homework, but drawing. That's friday night, and then on Saturday & Sunday I try to get ahead in life so that the rest of the week I'm not trying to keep up and I can dedicate a little time (when I not in class) to Art as well. That's one way I do it
Another way I use to do it it I would set a time, and every night at that time I would practice drawing, no matter what. I did the same thing with working out in the summer time, it was always at sunset not on purpose, that's just the time I came to find myself running the most, so about 9-10 after that I'd come home, I'd make a sandwich and rehydrate, and then I'd get some Chocolate Milk and a banana and Draw for an hour +. It was a routine, I didn't put any thought into it, I already had my supplies/equipment set up where I wanted to draw , that way I could just do it.
Often Times finding a where is harder than the when, which I think what you really meant by your question, once you find the where, Set up a few peices of paper and your tools, and maybe your laptop or some books for reference material. And then that way when you want to or have time to no energy is spent getting ready to draw, you just do it without even thinking about it or considering what you're doing.
That way, Drawing will become a habit; like brushing your teeth, taking a shower, or eating breakfast. One doesn't think about it , they just do it. It becomes part of your life like you've always done it and you probably couldn't survive without it, or atleast not survive a decent life. I meen really, what kind of person doesn't brush their teeth ? You brush your teeth right ? so draw like you brush your teeth.
~"With a little hope, and alot of try, anything is possible."~
~"The harder You work, the better life gets."~
~"The pain doesn't last, but the gain will last forever."~
~"Fear is my courage." ~Mr_S_14