Working out Calls Per Hour. 8 Hour Day.

Hi there, I'm trying to implement a system were I can do some analysis on my call center staff. I want to be able to find out how many calls a day they are making and with this information create a chart to detail a person's performance for that day.

I have tried to create a pivot table but I'm not sure whether or not this is the best way of doing this?

I have attached an example of one of my staff's call logs for last Friday's work.

I'm also unsure on how to group the data too, in the future I will want to find out how many calls are being made between certain time frames, ie 09:00:00 - 10:00:00.

Thank you.