This guy sounds like hes a bit of a control freak , lucky you found our now rather than later id say get on with your careeer and let him deal with it,, he will respect you more in the long run for sticking to your plan, how old is he? Noel
yes 20% sounds reasonable, you dont want to be to exact about it but if you end up spending more than 50% 0f your time cleaning, you know there is somethng not right , id say Noel