I should have stated in my first reply that I was speaking in very general terms. Of course how long you stay off will make a difference and I have no idea what the OP has in mind.
As far as reverting back to your natural limit that you were at when you first started supplementing...this I disagree with for a few reasons. Yes, the longer you stay off the more you're going to lose, but to continually revert back just because more time has passed is a bit iffy IMO and dependent on many factors. Where your natural hormone levels end up will determine a lot...GH15 sort of touched on this a little in his first response to the thread.
At any rate, just my personal experience, after nearly ten years of supplementing, I was able to maintain quite a bit for a good 8 or 9 months. I cut back on my training a little, but made it a bit more focused. Shorter sessions, but more focus on each set. I had to watch my diet a little more so than normal but for 8-9 months I was fine. After that, I lost a little more, but was still far from anywhere near my initial natural limit or whatever you want to call it. Of course, at this time I began having some serious physical problems, and no matter how I trained or ate my BF started to slowly creep up. Anyway, long story short, and this would not apply to most guys, my total test levels were at 63, this was after almost 18months of nothing...my thyroid was a mess, even my estrogen levels were almost non-existent....basically I was producing almost no hormones of any kind....my body had gone into shock and I was getting sick. Things are better now, the HRT program I've been on since May has brought me back to feeling like a normal human being again. I guess I'm getting off topic here but it's nice to feel normal again. I won't lie, I miss actually supplementing though, I probably always will....but it is what it is.