WE went on Tuesday and were going to stay just till lunchtime (thought we would have an afternoon shower, but it was a lovely sunny day). We got there at 9am and stayed till around 5pm - did most of the rides and the wave pool - it was a very full day and we really enjoyed it. I say take your time and stay as long as you can. Also get to the rides early to get a few done before the big crowds arrive, if tyou are going at a busy time - it really did fill up late morning onwards.