The calendar
How long does the whole thing take, from yes to lit?
About two weeks, counted from the day you accept the written quote rather than from the first phone call. The visit that produces that quote takes about 45 minutes, the quote then stays good for 15 days while you decide, and the install itself is one to three days on the roof, depending on how much there is and whether you are doing the front only or the full package with porches and patios. Timing may vary during peak season.
The calendar matters more here than the clock. Lead times stretch through the October to December peak, which is when our own crew is joined by trusted subcontractors to keep install dates, so a date inside that window is harder to come by than one outside it. Whatever the wait turns out to be, the install date is confirmed before you put down a dollar, so you know it before you pay.