Q:

When exactly does the edit link on a question get disabled?

Today I was about to edit a poorly-described question, and I noticed the edit link was disabled. 
When exactly does the link get disabled and enabled again? I mean, for example:

from when someone clicks edit to he/she closes-edit-dialogue/submits-changes?
from when the edit evaluation starts by moderators to its approval/rejection?

A:

Quoting the FAQ on Meta Stack Exchange:

There are a handful of conditions where we will stop accepting
  suggested edits:

A large number of suggested edits by you were rejected in the past week (at least 5 more than one-third of your accepted
  edits).
We are out of empty slots in the queue (200 on Stack Overflow. See
  here
  for details)
You have 5 suggested edits pending.
There is an edit to a particular post that was not approved yet. 
You are not logged in and the post is less than 10 minutes old.
You are on a child meta.
Your account is suspended.
The post is locked.

In the past no "edit" link would be shown at all; since July 2012 the
  edit link is
  disabled
  and the mouse hover tooltip will explain why an edit cannot be
  suggested, like "Account is not allowed to suggest edits".

