And btw, Lauda, since you are a member of an "Escrow Team" like stated here
https://bitcointalk.org/index.php?topic=1938190 could it be, that it is for your interest that you nuke my/our reputation down cause we just started an Escrow Service on our own?
I think yes! That case is pretty clear. Time to get Mods involved!
0 history of valid trades and "this user's email address was changed recently" = "escrow service"? Classic pajeet.

Solely my discretion.
There have been instances in the past where I deleted a negative after only one or two days.
In other cases, it took as long as three years.
I tend to go over my trust ratings from time to time, look into their respective references, look up an up-to-date post history of the rated user and make up my mind.
It helps if you keep reminding me of doing so after a while (say, a month or two), but please refrain from bugging me constantly about it, that'd just be annoying and might actually lead to a less favorable outcome.
There is no reason to revoke your rating on these two users, especially not if they are providing an "escrow service". This just transformed from a 'merit abuse' to a 'high risk' case.