I think that it would take everyone different amounts of time, due to all the variables. If you work, have kids around, what pattern, how complicated of a pattern, how much time you have to devote to quilting, etc. It doesn't really matter though. What does matter is enjoying the process and seeing the finished product.
My Jacob's Ladders that I posted, well I made them in 4 to 6 days. I don't work, my kids are grown and gone, and quilting is about all I do. If I was working or had kids or any other variable, it could take 6 months or more.