When it’s finished or I drop it. Also if it’s on an indefinite hiatus I might
I like to know the entire story before I rate because imo the ending usually has the biggest impact since it concludes the entire plot
When they are on hiatus I just forget about it then come back a year or two later and enjoy the ride.
Same lol I’m doing that with Noragami rn I honestly forgot how much I enjoyed it the first time around