@wavesculptor I wouldn't want to put a specific number on it as it can depend so much on context. For example if someone is posting about watercolour paintings there may be many different versions of one tag they need to add to account for plurals and spelling differences (watercolour, watercolor, watercolours, watercolors etc).One thing to say though, if a hashtag is irrelevant to the post then that post is spam. You can report posts using irrelevant hashtags as spam posts.