It's been 5 days as of today since I started my first batch (I'm not counting the Kevita fail). Yesterday (Day 4) there was no fizz, moderate sweetness, and there was a weak vinegary-tannin flavor and aroma. Today the liquid is only slightly sweet, the vinegar-tannin note is becoming more defined as a taste and smell, and there is a nice little fizz going on. Day 4 was not really interesting to me if someone handed me a glass of it to drink. Today's stuff is definitely more drinkable. I'm curious to see how Day 6 goes.
Keep in mind that the first fermentation won't give you a lot of fizz; fizziness develops in the second fermentation, when you seal the bottles.