| Basses acclimate to various locales. I don't know if there is a rule of thumb for how long this takes, but I would guess that a couple of years through the seasons would be a minimum. In Chicago, we go from upwards to 100 degrees in the summer to below zero in the winter. I've owned my Juzek bass for almost 30 years and have never had a top or back crack, a few rib cracks and seam splits. I think dryness in the winter is the biggest culprit, so if you keep your home humidified as you do, you probably won't have any problems there, but if you take it out to a very dry room, with a fireplace roaring, for instance, that's when trouble may set in.
I think that once the wood gets used to the expanding and contracting it is called upon to do in certain climates, basses aren't all that fragile within the obvious limits. A 7-10 degree temperature swing is nothing but a drop in humidity from 40% to 10% could cause problems, especially in a newer bass. | 
