I tend to be at the studio about half an hour before a hire is due to start. I am happy for you and/or your model to arrive during that time. You can use that time to bring in any equipment/props you will be using, have a cup of tea or coffee and generally relax prior to your shoot. Similarly, your model can be getting ready, doing hair or make-up.
Please note: While I normally arrive 30mins before a shoot is scheduled, I don’t guarantee to be there that early. The only thing I guarantee is that I will be there ready for your scheduled start time.