It's kind of impossible to say, because the crowd calendars are wrong as often as they are right, if not more. So a day predicted as an 8 could actually be a light crowd day, and a day predicted as a 5 could be packed.
Generally speaking, on a very crowded day, SM will see standby times of 90-120 minutes at peak, perhaps as high as 150 minutes (I've seen a little higher on the extreme side of the bell curve). BTMRR will get 60-90+ minutes, in my experience.