I wanted to calculate the average of hours per week for a specific period of time.
So I went to the total (tab) view, selected a period of time and the amount of hours of all sessions is shown and the week count is given. Here one could directly display the hours per week.
What I noticed is, that the week count is amount of weeks any selected week day is in. So if I select the time from Saturday to the following week on Wednesday, it shows 2 weeks. I would rather 1 week to be shown here. So count the number of days inbetween two dates, divide by 7 and round up.