We attempted to do this last year on a very busy day, but it didn't quite work out for us. We missed the 2nd rope drop by about 2minutes and that was enough time that Jungle Cruise was a mob scene. from there we very quickly went to BTMRR, but by the time we arrived BTMRR was also a bit of a mob scene. I think posted was 45, and we only waited 30. not horrible, but not great either.
Later that night though, the wait was more like 20minutes. I don't recall the exact time, but it was approx an hour before park close. After that, we rode Splash- no wait. Part of our group got SOAKED. We have not gotten anywhere near that wet on Splash for many years, but our last ride on it, we got pretty wet.