I'm currently getting my Bachelor's in Electrical Engineering. I make time during the weekends and during breaks.
I also tell people that I don't have a concrete schedule. They know coming in that I won't update regularly because I have school and work. Long as you make time and let people know, you're good.
And remember this: you're never too old or younger to get back into comics. If you feel you've become too busy for your comic, you can always come back to it. Nothing gets lost to time unless you let it get lost. There is no rush -- you do what you need to do to do right by yourself and your life.
It's amazing that you're going for your masters, and I'm proud of you. This is important to you, and so are your comics. But you getting you masters doesn't mean you care less for your comics. You're just doing what you know is right for you. And no irritated "fan" of your comic can tell you differently.