10 hour shift. You end up working 70 hours per pay period. The trick is what day the shift starts. If the shift starts on Monday and ends on Sunday, you work 60 hours that week (pay perido) with 20 hours of over time where you get paid 1.5X. This translates to 30 hours therefor 70 hours of pay. Then you got the Sunday which is 10 hours... so work 70 hours and get paid for 80. (Work 60 hours one week and 10 hours(sunday) the next = 80 hours paid)
This is a payroll period game which benefits 7 on 7 off pharmacist. For graveyard shift, shift differential is $6 per hour on weekdays and $10 per hour on Weekends for us. You do the math.
For less friendly employers, they have the 7 on 7 off shift start on Wednesday... which ends up being 40 hours one week and 30 hours the next...no overtime. So you work 70 and get paid for 70. Don't do it.