First, please understand, I am only an owner, not a dealer and not an expert.
When my tub was delivered, I thought everything was good to go. My tub was nearly filled when we found out the electric wasn't quite right. Anyway, long story short, my tub was filled with water for 3 days before the electrician could come back out. It was fine. I figure if mine waited 3 days, a few hours for you should be ok.
Maybe one of the experienced guys or gals can tell you for sure!!!
Enjoy!!!