[mothered]

At the moment, the timeframe is set pretty high

I think It's once the time-frame has elapsed that's the Issue, meaning posts cannot be edited thereafter.

As with my case here, I can only edit my thread's post "within" 87658 minutes:

Spoiler:

There are 1440 minutes In a day, so 87658 ÷ 1440 = 60.87361. This means I can only edit my post within "60" days (round figures) after posting. Once that time-frame has passed, posts cannot be edited- ever.