Without knowing more about you, here is my opinion . . .
The short answer is the longer you have had a "strength"
the less you will lose over the course of time.
The long answer is the longer you maintain the muscular
tissue you developed (with or without the assistance of
AAS), the more likely your body is to keep it, to think of
it as "normal".
Here is another way to look at it; if you gained a 30lbs of
muscular tissue in the course of you first year training,
and then quit training altogether, you would probably lose
most if not all of your gains.
But if you maintained that 30lbs you gained for 5 -10 years
and then quit training, you would probably keep most if
not all of your gains gains.
Again, I think much of this comes down to establishing a
set-point, and the longer you are at that new set-point,
the more likely your body is to want to preserve it.