By default, the file contains:
15 4which means that you can have an event every 15 minutes and that the default length is 15 x 4 = 60 minutes (1 hour).
The base unit must be a divider of 60 (1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30). For example, you can have a wcal.def file laike this:
5 6which means that you can have an event every 5 minutes and that the default length is 5 x 6 = 30 minutes.