An hour? That would explain the blurring of some features then.
Jupiters orbital rotation period is 10 hours, so individual high-resolution images need to be captured within a period of 2-3 minutes at most. Your image is not a very high resolution but I still wouldn't go over 3 minutes, or you're getting rotational blurring of the individual features.
In 3 minutes you're obviously not going to get as many frames in, which is the downside. Get that 900nc cranking!