How long does it topically take roofers to finish an entire roof?

[QuoVadis Gates]

I got a new roof today for my 2 flat... it’s a flat roof ... Roofers started at 7 and were done by 4:30.

Should I be weary or does it usually take 1 day to finish an entire roof...? 

[Rich Bultema]

HA, thought this would be a complaint that the roofers are taking too long. Around here, the roofers are struggling to pull the proper permits because most government offices are closed. Of course not all bother with permits.

As far as your roof and actual time on the job site, depends on the square footage of the roof, the amount of obstacles (plumbing vent stacks, roof AC units, etc.) and of course the size of the crew makes a huge difference. Without knowing those things we cant REALLY make a judgment call but in and of itself, it would not alarm me that it was done in a day. Remember, a person who does "fill in the blank" all day, everyday gets pretty good at it.

Have you worked with this outfit before? Got references? Would you know what you were looking at if you inspected the roof yourself?

Ultimately wouldn't worry about it unless you see something obvious.