Dug thru the stadium construction thread, it took two weeks from the first day they rolled out the turf to when they started the rubber-pellet infill, then a little more for striping, logos and numbers. This isn’t like a new stadium that has to build a base, drainage, etc .
The Fieldturf website says it’s even possible, depending on conditions, to just put a new rug on top of the old one, saving about $150 K. If you want to.