According to 'cliff notes' a Napa Valley winemaker sent me, mature vines
should yield about 5 bottles of wine. Mature being somewhat subjective, I
remember something like three to five years in my discussion. A lot of that
depends on the skill of the vine-meister, of course -- how well the vines
are cared for, how expertly they are pruned, etc. He said one acre of
mature grapes is good for about 5,000 bottles.