While it will only take a week or two from the time you dig the hole for your inground vinyl liner swimming pool until your vinyl liner swimming pool has water in it and is ready to swim in, the process of building the pool is a little more complicated. Depending on the season, you may wait more or less time for Fronheiser Pools builders to get to your build. You may also face delays with permits. No matter what pool you are planning to build, the best time to start is now.