I have never had issues with raiding interfering with my day job or indeed my studies. However, the hardest part for me is when I get messages off friends where they have decided on a spur of a moment to go out and do something which collides with a raid time. It's often put me in a rock and a hard place where you have to do a sort of compromise. However there isn't much I can say for advice as stuff like that is largely dependent on the person and what they want to prioritise first.