1 dats, 19 hours and 39 minutes. I don't understand I think it's bugged I've been on this forum and browsing a lot more than 1 day.
Just one page ago, you have at least 2 people explaining how that works:
Yes I noticed it too, I have 11 days but I spent literaly months logged in, maybe it counts only when you post something, then stops after a determined time.
I don't think you actually have to post something, but the general idea is right; it counts as long as you are actively using the forum (like browsing through the threads), and stops after a set time of inactivity.