Most Staff will work full days, and usually leave half hour to a few hours after the park shuts. You are able to start work whilst 15, however you will need to let HR know that you are 15 and are still in full time compulsory education. Once you let them know this, they will apply for something called a "Child Workers Permit" which allows children in full time education to work. Once this has been granted (if it's granted, which it usually is) you'll be able to work