When we do RD at HS, there are a few places people run/fast walk to: Jedi Training, RnR coaster, ToT, and TSMM. It all depends on whether it's a busy day to attend, if you are far back in the queue at RD so take a while to get in, and how many people have the same idea as you. Some people may also have fastpasses at 9am so they will add to the queue at TSMM. If everything's in your favour I'd say you wouldn't wait more than 15 minutes.