I know the format which this.
My account
-----BEGIN SIGNATURE-----
-----END BITCOIN SIGNED MESSAGE-----
Here is the unedited post where I posted that address: ...
OR
I sent that address to someone in a PM with PM ID#...
But when I sign a message using blockchain.info I got this format. Is this still valid? How to sign a message with the same format above?
Here is the unedited post where I posted that address: ...
OR
I sent that address to someone in a PM with PM ID#...
How long the recovery process take?
Is theymos the only who can recover an account?
You can just add those "-----BEGIN BITCOIN SIGNED MESSAGE-----" lines back, and check if you have done it right on brainwallet page (https://brainwallet.github.io/#verify).
Yes, theymos is the only one can help you in this case.
No idea how much time is needed, but I did read people waiting for days and weeks without any reply (not sure if they sent the PM in correct way though)...