Life's been busy...but so good
If you take time off of caffeine and supplement with an Adrenal Restore product, it shouldn't take an extremely long time. I think GAT has one. And a St. Louis company called 1stPhorm has one that is awesome.
If you see above, caffeine tolerance is unrelated to adrenal hormone stores.
Caffeine -> adenosine receptor blockade -> (several steps) -> adrenergic receptor stimulation
In response to prolonged caffeine intake, the adenosine receptor upregulates and the adrenergic receptor downregulates (this last part is hypothesized in many papers but I've yet to seen it demonstrated unless I've missed a new study).
Regardless, there isn't a loss of adrenal hormone (NE/E) stores. The body can produce these hormones very rapidly, hence why when you exercise (or do any other "fight or flight" stuff), you don't turn into a burnt out, sleepy old man. These hormones are able virtually on demand at any time in healthy individuals.
So taking an adrenal restoration product, which usually contains something like pantothenic acid and bovine adrenals (both of which can theoretically help produce more adrenal hormones), won't affect the cause of the caffeine tolerance. Pregnenolone and rhodiola may ease the transition, but they're not resetting tolerance, they're just acting as mood boosters.