I cannot seem to find details of a windows Defender schedule option either in Win 10 - Am I missing the obvious somewhere ? I assume you are running Win 10 in one of its release forms.
I think the best option is to install an alternate Anti Virus program of your choice.
For the moment I'm running Norton (used because of a remaining licence) and will be replacing it with AVG free in Feb 17. on both the Win 7 Pro & Win 8.1 PC's.
My main problem at this time is possibilities of external vulnerabilities with my router.
Does Win 10 support SFC/Scannow as a quick check on system file integrity.
Try this:
https://support.microsoft.com/en-gb/...ndows-defender
CAT III