I realized that after quite some time that if we didn't edit out posts, we wont be able to edit it anymore. I just wanna ask how long does it take exactly? So I can edit my posts right before it

The first post in a trade topic can be edited for 3 days. As a site customer it's 5 days, as a verified member it's 7 days:
https://forums.d2jsp.org/verify.php

Editing them to reset the time frame only works for the first post in a trade topic. Regular posts can be edited for 30 minutes, 1 hour, and 2 hours respectively.

thank you. recently i tried to do 2 days cycle. looks like i will need to keep it that way because if i dont edit them soon enough in 3rd days it might be too late