when does clash of clans start auto upgrading

Clash of Clans starts auto-upgrading after about 90 days of inactivity. It’s a catch-up feature that kicks in when you haven’t logged in for roughly three months, and it can only happen once per year.

What that means

• If you log out and stay inactive for 90 days, the game may begin upgrading some buildings and other progress automatically.

• It’s not something you can trigger manually.

• After it has activated, you generally need to wait about a year before it can happen again.

Practical note

A few older or community posts mention different timing, like 35 days, but the more consistent recent reporting still points to 90 days as the trigger.

If you want, I can also turn this into a short forum-style reply with a cleaner “Quick Scoop” format.