AutoRouting: limit resource time

Summary

How do I limit the time of a resource to two random days?

Content

Hi! 

For the current support I'm providing, I have to enable AutoRouting in Field Service Cloud. I've got two types of resources: resources that for level 1 maintenance and level 2 maintenance. Since the L2 maintenance resources are more expensive, I can only use them for two days. It doesn't matter if that's a Mo-Tu, or Mo & Fr, or any other combination: just two days. L1 engineers have full availability and should be planned first.

Is there any way that I can set this restriction? Help is much appreciated!