If you have an appointment, it doesn't take too long at all. It also depends on how your child cooperates lol My daughter fussed a little but they have stickers and toys to keep them entertained. Roughly half an hour, if even that.
We were in and out in 40 minutes without an appointment last year when we went. We also went almost immediately after park opened. I think we did 1 ride and then came back to it.