The thing is, there's no such time as a great time to refurb, especially when it's 4-6 months. Conventional wisdom says to do it after holidays end, so January through Spring Break-ish, but even that's only 3 months or it's down for the busiest parts of spring. Plus a lot of other things go down in January (the 1-2 week refurbs), and if everything is closed then no one's going to show up. A lot of spring is actually much busier than summer, thanks to the weather, so they'd hate for it to be down then. The only other time is fall, but really they just have September as a slow time before October kicks off with Food and Wine plus Halloween, then about 3 weeks slow before Christmas stuff starts...it's easy to find a lot of 1-3-week time periods to refurb something, but for anything that needs months there's never going to be a time that lacks downsides. Obviously it sucks any time your favourite ride is down during your vacation, but I don't think the right answer is "It shouldn't be down during my trip, it should be down during other people's trip!"