The 80 minutes sounds about right, or a little low for a standard construction home, every structure will have different conditions to consider, that is why we don't use a per opening price, we found the best way to estimate a custom home job, was to do takeoffs from the plan and use our actuals for pricing, then use a square ft. price to check against our price, this allows us to bring the job in with a profit.
Job conditions can, either speed a job up, or slow a job down, things like type of framing used, heigth of ceilings, how many holes required, will other trades be on site at rough in, is there a rough plan, or is it plan as you go, will there be any changes on site, due to other trades, using your planned space?
