100+ hour week question.

So my employer wants us to work 9-:5:30 Monday to Thursday and 9-:4:30 on Friday.

During 4:30 to 5:30 we have time to go home and setup working on call for the whole weekend.

Albeit this only happens once every couple of weeks.

So we are working, 100 hours I think in a week, if I'm correct?

Is that normal or right?