They would have to just hang out and not really be able to leave for 5-6 hours while our other friend is working, but could do their own thing. Basically they are just there for safety reasons if anything happens to our friend doing the work who we have a fair price established. First friend has a lot of sedentary hobbies so boredom isn't a risk but I want to treat them fairly.
Idk if my friends asked me to house sit or dog sit I wouldn't expect compensation. I feel like a bit would be appreciated but idk your relationship.