I work full time during the week and study in the evenings when I get home, although I don't have too far to commute which saves some time. Sometimes I will study for half an hour at work during a lunch break when I can. I don't have a family or girlfriend at the moment so I don't have to worry about making time there.
I fly on Saturday's (weather permitting) and study on Sundays. I have found that several shorter periods of study helps it to "sink in", whereas if I sit down for several hours at a time I find that I read the words but don't understand the content.
I intend to keep flying throughout my ATPL studies as it provides added incentive and motivation to get through the exams. Since I started the studies I have completed my night qualification and have started the IMC course (exam passed). I see it as a mix of theory and practical, where I try to apply some of what I have learned to my flying which helps me to improve both.
Everyone is different but this is what works for me.