An update where the story moves along is ideal
Viewing post in Dev Log i3.3: Do Ya Like comments
This seems to be the consensus from what I've seen from people. As long as the update makes meaningful progression in some way, be that story or relationships, people didn't seem to have a strong desire for a particular update length.
It was more that as long as the length of time spend making the update is justified by the content of it, rather than the actual amount of 'content' within. So longer but with a lot of meaningful things was good, shorter but still with notable progression also good.
Which is more or less my opinion too, so it's nice to know I think similarly to others.