I think if you love to write, there's always time! I also think that as students, we have a lot more time than if we were in full-time jobs - in fact I know this, as I worked full time for two years before I decided to go to uni, and that was much harder in terms of finding the time and energy. I did it then anyway, because it's one of those things I can't do without.
Last winter I woke up at 5 most mornings and wrote for two or three hours before days of lectures and academic work began. And I write on the tube, in coffee shops when I'm waiting for friends, when I have a free evening...
I think it's all about your mindset. If you think of it as a chore you have to fit in, then it'll be hard. If you think of it as making time to do the thing that keeps you going, you won't have a problem