I believe I have mine set to come on at 3.5 and off at 2.5. I like my beer cold, but I didn't want to risk it getting below freezing in the bottom of the keezer (my probe is in a bottle of water on the hump). I left the compressor delay at the default, because my cycle time is long anyway.
If it's on a porch, I would watch closely for areas of condensation this summer and seal those air gaps. It will run a lot in the summer, and if your area stays below freezing for long periods, you may need to use the heat side of the controller as well!
If you're not having fun, lower your standards ...
My keezer build thread --> Mid-Missouri freezer conversion