I assume you are referring to a nickel build? Other than being bored, do you change it because of change in taste? My builds have a weird change in taste after a few weeks.
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I only change when I'm bored or if I forgot to refill the tank and get a dry hit (which, since using TP, is basically really hard to do). Sure a 250ml+ wick won't be 100% but surely around 90%. It obviously depends on the juice too. I don't think a NET one wouldn't gunk a coil way earlier than that.
Holy crap, what juice was that?
70%VG, 30%PG Strait menthol alternated with 50%PG/50%VG Copsa Heisenberg.
Its more about the wick. Check out the Rayon thread. Many cross the 100ml barrier and some 250ml+ and there are some medium gunk juices among those.