Formulas to tally total hours for each staff from schedule

Hello,

I have a weekly schedule template I have put together for our nurses. I need a formula that will tally the total hours each employee has worked based off of their schedule for that week. I've tried sumproduct, but because of the format of my schedule (or my limited understanding of the formula), it's not working for me. Maybe stringing some sumifs together to compensate for the several columns involved? I dunno. Any help would be greatly appreciated.