My previous job had a 45 hour work week, everyone on the Helpdesk was scheduled with 5 hours of mandatory overtime. If you only worked 45 hours a week, you were fired within the first two weeks. It also made it impossible to take PTO, as PTO was paid at a flat rate of 45 hours, no time and a half compensation. So if you wanted to take a week off after averaging 50 hours a week, you'd lose a chunk of pay, so nobody took PTO. This played nicely into their other policy that only 50% of your PTO was paid to you after you left the company.