When I went late March, I saw the LONG, weaving line at AstroBlasters, and the CM's said it would only be a 15 minute line. It was really 18 minutes (I timed it because I couldnt' believe it!), but not bad! I loved it!
Line moves very quickly. Also it can vary a lot during the evening, we waited just under 15 minutes last night, and when we got off, rode again in less than 5 minutes.