Helen wrote:About how many mx hours are you seeing per flight hour required? And what age is the airframe you are basing that on?
Here's a worst-case answer, Helen, involving a 5 year old aircraft that I purchased at a very favorable price, knowing it was coming due for some very time-consuming maintenance (including a Rotax 5 year rubber replacement, new brakes, tires, landing gear work, etc.) In a five month period, that plane flew a mere 89.2 hours, during which it underwent considerable downtime totaling 107.5 person-hours of maintenance. That plane brought in $10,204 in revenue, but consumed $9,138 in expenses. Believe me, that's no way to make a living!
Generally, I expect to put in 15 to 20 hours of work per 100 hours flown. But then, as mechanics go, I'm slow!