Depends on unit power, age of trailer, and ambient temp. I got a new trailer with a big unit on a 70 degree day it would take maybe 15 min. 13 year old trailer and smaller unit at 80 degree ambient it might take 40 minutes. These are empty without cargo inside. Cargo at temp desired should be almost an instant pull down. Hot load can take up to a few days to pull down. Hope I helped sir.