So, TROUFION, in answer to your questions:

Quote Originally Posted by TROUFION View Post
...when has a fixed timetable or timeline for withdraw been effective?
Pretty much never.

Quote Originally Posted by TROUFION View Post
What has been the aftermath of such evolutions?
The wrong side usually wins.

In the current context, and granting the the Ba'athists, al Qui'ida, et. al. an I.Q. above room temperature, they bide their time, stockpile arms, and wait until the last helicopter departs the roof of the U.S. embassy.