Welcome back to the work world and be happy it's only 40 hours a week! When I got my job I thought it would be a 9-5. Turns out it is usually 8am on Monday - 6pm on Thursday
Good news is Fridays are only 8-5!!!
Good luck with the new job. As for the 40 hours, just remember The Little Engine That Could- "I think I can, I think I can..."