Hi. Sorry if this has been asked before but when u say busy/peak time what queue lengths are we talking about with regards to waiting time. Thank you.
These go by the my calendar only, however as a general guide (please note this is far from 100% accurate - any number of things can upset the calendars accuracy).
Quiet - Less than 15 mins for most rides
Low - Less than 20 mins for most rides
Mid - 30 or less for most rides
High - 45 minutes to an hour average
Peak - Hour+ waits
There are a number of exceptions, Big Thunder Mountain basically always has a long queue, as does Crush's coaster, the Fantasyland dark rides usually follow suit.
Weekends (Fri/Sat/Sun) will always have bigger queues than Mon-Thu.
Public holidays are also busy, but usually on the calendar.