Joe,
The time required to do a rough inspection would depend on who you are dealing with and what you see in the first couple of minutes.
Dealing with a highly qualified contractor should get you out of there in 15 to 30 minutes. Dealing with a DIY installation, I'd say one hour minimum.
The more I see wrong, the longer & harder I look, but you eventually reach the point where there are no new violations, just repeats of ones you've already found.
As far as your inspector in the 100,000 population town is concerned, with travel & paperwork, six inspections would probably be the maximum, but I'd bet that 4 would be the maximum on many days. Also, these inspections would involve more than lick 'em & stick 'em with the "I was there" sticker.
Tom
