EZ-TimeLog lets you import the actual used time into EZbooking. The module can be used to compare actual used time with scheduled time, to spot usage without previous bookings and to charge for the actual used time. 

For each bookable resource your administrators define tolerance times, rounding rules and to what percentage booked unused time should be charged. With the flexible invoice details report you can choose which information you wish to export regarding the user, actual used time, the calculated price and much more.

Read more about EZ-TimeLog (PDF)