Yeah, it doesn't matter if your lecture is right after your tutorial or vice-versa. You'll find that often your lecture or tuturial will not go for the full hour, or two hours or however long it says......
I don't know if it is official or if it is just good manners, but most often classes start at 25 mins too the hour (if not later) and finish 25 mins past the hour (if not early). So you should have about 10 mins between classes.
Of course there are always those lecturers and tutors that have either poor time management or an over rated sense of importance for their subject that mean they either go right to the half past mark or in some cases will continue until the next lecturer pokes their head in and asks them to leave.