There is an option in the Long Form > Personnel tree to easily complete time-reports according to booked times for one or multiple users for marked days. Please see attached pic: you need to load the user in the Personnel tree, select the time range (in my example I chose the complete month), and finally click on the user's icon to get the pop-up menu where you can choose the option "Set Time As Booked For Missing Timereports On Selected Days".
