i think it really depends on how often the tub runs. Right now, as it is colder, it is turning on to heat much more frequently so its tripping more frequently...2, 3, 4 days. Actually tripped 2 times in 24 hrs at one point, which is rare. During the summer it could go 2-3 weeks without tripping. It won't have to perform probably 2-3 months for me to feel real confident. Which also makes follow up with caldera difficult because they will think the issue is resolved if I dont call them back soon after getting the board.