at a school in New Zealand my friend went to for a semester, they did 15 mins or so of P.E before each class
I think [optimally] there should be more [than there is now] for yrs 7-10 and an optional class for yrs 11-12, for fun, as Odette intimated and because, as well as keeping fit, learning and improving at a sport/activity which combines physical and mental skills, can be very edifying and help with any other type of learning. I'd say the same for Drama.
Of course, the teachers should be aware that some students might find particular activities especially difficult and/or the experience of being in a P.E/Drama class very stressful, such students shouldn't be forced into an activity which brings them largely negative outcomes.