Pré-op tests

I can't remenber how long it takes for the pre-op tests at the hospital. I had mine a year ago and I just can't remember. It's my daughter 's turn tomorrow. Her appointment is at 8:00 and she works at noon (just 5 minutes from the hospital). Anyone can tell me?

I think that they told me 3 hours, plus sign in time.  I was done in less time than that.