I'm blowing out on average 6-8 zone systems. For 6 zones it's taking me about 20-25min and on 8 zones about 30-35min. Thats from the time I get out of the truck to the time I get back in and leave, I'm also solo. 95% of the time I have to go inside to find the shut off. Am I on pace or on the slow side? I'm also jumping usually 2 zones at a time and am going to try 3-4 tomorrow. I'm running a 185CFM, is this enough to do 4 zones at once?