How to set a time limit for entering absences?

Do you need to set it so that users can only enter absences into the system with a certain amount of time in advance? Or do you want to allow back-entry, but only until a certain time after the start? Sloneek allows this feature.

Go to Settings / Absence and create a new absence, or edit an existing absence. In the dialog box you will find a checkbox called Event timeout:

Check the box and then just set the slider to the desired value and save.