There is no hard rule. The minimum amount that looks good for the art style or the technical constraints of the game.
Example #1: The trees are 6-sided cylinders.
Example #2: The valence count of the cylindrical parts is exactly as high as it needs to be in order to eliminate a jagged look in the silhouette at the closest distance you will look at the object.
*** All images from Google Images, I take no credit for any of the above works. ***
Even if it is a hero prop , generally I use 16 sided cylinder I think its wrong. If I'm working on a game asset my main purpose should get a clean bake without any jaggey edges. It 's all about situation or game style.
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