In general, a typical home standby air cooled generator installation will take about one day to complete. Liquid cooled models would take longer to complete. If a concrete pad is necessary it would add a day or two for the concrete to dry. The length of time is based on a typical application. It does not apply to applications that require extended runs of wiring or gas piping. There are always some small unforeseen issues that may require us to return but the main install is generally 1 day.