I would say that even if you got there and inside say by 9.30, having been keeping an eye on the queues for e.g. saw, Colossus and nemesis this/last week (if they managed to open on time) were easily getting to around 45 min+ by 10.30. Yesterday Saw had already managed to hit "90+" minutes by the time it got to 10.25.
I'm going on Friday and slightly dreading how mad it'll be to be honest (when I booked I had hoped it wouldn' t be too bad), although its not sold out under 'reduced capacity' as people say I doubt its much different to a typical summer weekday in non-covid times.
Setting expectations is important but I'm sure by now people should know its just going to be mad busy for the rest of the summer due to that pent up demand. Not saying thorpe should just shrug their shoulders at that though- definitely should be doing all they can to improve throughput and distancing people on rides is a little silly when they don't enforce distancing in queues and people stand shoulder to shoulder almost.