You'll probably get a variety of different replies, but 60 hours sounds reasonable to me. However, you may not have much flexibility to choose those what those 60 hours are.
Class & clinical schedules vary widely from school to school - be sure to meet with representatives from the nursing program at the school you are applying to to get a clear picture of their expectations. In urban areas, hospitals juggle multiple nursing schools to provide clinical time for each - there sometimes is very little flexibility.
My program was strictly M-F, daytime hours, except for some limited clinical rotations in the evening (3-11). Other students seek out programs that involve evening/weekend hours, leaving their days free.
Here's hoping you find a good fit - good luck to you!