[ghaff]

I've always said that I have a 5 season rule--especially with network-length 20 episode seasons. Hit somewhere in that vicinity and I'm tired of the setting, style, and characters. There are a number of series who got to the 5, 6, 7 season point and even though they didn't necessarily "jump the shark" I just got less and less interested in them and eventually stopped watching.

I actually really like the fact that streaming helps allow for limited runs with episodes of the length that they want to be though one always hopes that a series ends at a natural point.