When I was there last month it was maybe 15 minutes, sign said 20 but it was definitely less than that, I rode it right after the fireworks started going off. I've done it at park close several times and it's always under 30 minutes every time, of course during more crowded times the waits may be longer because obviously more people are in the park, but it's always my go to strategy because I find RD SDD to not be much help in the waiting department.