I think you should expect something between 3 days and 10. :-)

Even knowing the grape variety, the yeast variety, etc. it would be
difficult (and pretty pointless) to try to predict precisely how long
"fermentation" should last. With a nice warm temp. like 80F, assuming
adequate nutrients, etc., I would expect in most cases the really
vigorous fermentation would be over in 5 to 7 days. I've had a few
that finished in about 3 (once they got going). If it takes longer
than 10 days, I'd start to be a bit concerned. Anywhere in that
range, though, is just fine. It takes as long as it takes. If the
yeast are happy and doing their job, don't worry about it.

Doug