Help with using schtasks, defining a specific time

Question

I have successfully created a task, although I am having trouble defining when it should occur e.g. using the /MO command.

How is it possible to tell schtasks to execute this on e.g. every 5 days on the 4th hour of that day?

schtasks.exe /Create /SC DAILY /TN "testing123" /TR "C:\Program Files\test\scanner.exe 'C:\'"