Wow, that's gonna be a hard question to answer because there are SO many variables. I have 18 x 36 vinyl IG that was installed 8 years ago. Have steps, slide, diving board, had extra 3 1/2 feet of length added to the shallow end above their standard package, because my kids were very young at the time. Took them about 5 days, start to finish, not including concrete decking--and I think we paid in the 27K range (northwestern Louisiana). If I had it to do over again, I'd do the exact same thing--except that I would have had a SWCG put in as part of the package!

Janet