I wouldnt play for less than about 45 minutes. You just cant develop reads and exploit players in 10 minutes. An hour every couple of days would be alot better imo. At least that way youll have 40 minutes or so of at least knowing who the TAGs/LAGs and passives are.

edit: If you are serious about only being able to manage an hour at a time or less Id seriously consider moving to a site that allows datamining. At least that way youll be able to sit down with some "reads".