We got to DCA at 7:30 and only had a 20 minute wait at RSR. You shouldn't have more then a 45 minute wait EDIT I didn't see that this was for the fast pass. This is for the actual ride. Sorry
We got in line at around that time (might have been closer to 7:30, I can't remember) and it was 45 minutes. Then again, the ride was down so everyone was in that line, so that could be considered a worst case scenario.
Thanks! If the ride is up and running at 7, we will do it first thing ... if not, then we will get Fastpasses, and I just didn't know how much time to allow if we needed to do that.