I don’t think anyone knows. Looking back, it appears this somewhat seasonal refurbishment has taken anywhere from 3-9 weeks. It was closed for a lengthy period during COVID and didn’t open immediately if I recall correctly, so not sure if that affects closure length time. https://touringplans.com/disney-california-adventure/attractions/grizzly-river-run/closures
Haha! I guess those of us from cooler climates have a different definition of "when it warms up." I bet you are right... here is hoping it changes before we are there!
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