Vince,
We've found the 1:100 ratio to be realistic. But of course each situation is a bit different. Our properties are still less than 10 years old, and our techs do not paint, but they do take acre of all appliance repairs. They do about 40% of HVAC repairs, and accompany a contractor on the other 60%. We're in an urban setting, so the techs do very few exterior tasks.