Well, it is also considered that 10 weeks of injections is actually 12 weeks of cycle time when you consider the half life of the test E. You usually don't begin PCT until around two weeks after your last injection.
500mg/w is a number that is tossed around. 500mg of TestE will be the equivilant of roughly 400mg/w of test. Depending upon you size, history and response it can be sufficient and effective.