If you are asked to be somewhere at specific time during an interview, take a moment to think about your schedule and be realistic. If you already know that arriving early to the bus depot is one of the job requirements, then be even more sure that it's something you can promise when you arrive to the interview. It's never helpful to commit to doing something you already know you are unable to do. If you're not a morning person, maybe you could find out if there are later shifts available. Be honest and only commit to showing up when you know you can deliver!