Employee hours - total for each employee

[1joie]

Hi guys, I need your help!
I have been trying for weeks to figure out a formula to summarize hours for each employee from my Excel spreadsheet. I didnt find any solution

I track hours for each job in a day. For each work I have put down a name, start time and end time - for each person involved. There can be up to 10 people working together on a job.
There can be unlimited amount of jobs per month.

What I need is to find a formula which will bring list of names and monthly total of hours for each person.

Example:
alpha - monthly total 50 hours
beta - monthly total 32 hours (those numbers are just as example, they are NOT from my speadsheet)
etc.

Can you help please? Employee hours.xlsx