How long to "seed" a new filter cartridge?

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Hholly said:
Either for use in another tank or to replace an existing worn-out one? Thanks!

Ive heard 2-3 weeks, but i definitly wouldnt chance it, and wait a month lol
 
had two filters going on one tank and the brand new filter had no issues handling the ammonia when i took the other one off 2 weeks later.
 
I've heard 40 days somewhere so that's what I'm going with
 
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