I brewed a Saison using Gewürztraminer grape must and Nelson Sauvin hops. I used 3 quarts of must in secondary added to 3 gallons of beer. I ended up aging it about 6 months before it hit its prime. At that point the hops had dropped off and the wine character took over. I used 2 ounces of hops in the whirlpool.This was an awesome beer!
I know it's not exactly what you're looking for, but it's at least one data point you could reference. If I were brewing an IPA with wine added I'd guess about 2 bottles in a typical 5 gallon batch would be a good starting point. But if I was using wine I'd probably just mix it in the glass at serving time rather than adding it all in the beer.
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