30mg is a high dose for a 1st time user, but not unreasonable imo..
I wouldn't drop the dose since you started day 1 at 30mg/day. If it were me I would have started the 1st 2 or 3 days at 10mg. Then bumped up to 20, and finally 30mg if need be.
Shoot for 21 days. Most users report that the 4th week is all sides/no gains with superdrol anyway. 3 weeks should be good.