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Yes, months was right. I think for us earthbound observers it was at least a month but Hubble was able to detect them for longer. Wikipedia is correct.
I remember I was able to see the result of one of the larger impacts just after it occurred (because they were all on the dark side) and it grew and changed over two hours as Jupiter rotated around. It was a seminal moment in my observing history that night - the universe was no longer seemingly static in my short lifetime, it really became a living, changing thing.
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