work hours

I get to chose what hours I work and can not decide, 7am to 3:30pm or 7:30- 4pm or maybe 8am to 4:30 pm. Right now I am thinking that I might pick the 7am to 3:30pm. This way I have time for appointments after work and do not have to take time off during work. The question is can I get in at 7am.