Several factors will determine how fast or slow your new commercial roof will be installed. First, the kind of roof you have will largely influence this. Does it have multiple layers? Then, other factors come into consideration: such as the scope of the project, how large your roof is, what material is being put on, etc. Is it a roof repair, replacement or restoration project? Lastly, weather also plays a crucial role in determining whether the roof installation will be completed on-time as sometimes Mother Nature requires a project to be re-scheduled.