Depends on your definition of drinkable.
The fist kit I made was a 28 day and I started drinking it on day 29. It was not bad, but it was not nearly as good a commercial wines. It was a bit disappointing overall. I used it to make sangria as the fruit juice overcame the roughness of the wine.
About 9 months after the initial bottling, my wife opened a bottle for dinner. I did not recognize it. Wow, what a difference. At a year, it was better yet.
My reds I bulk age for at least 9 to 12 months. It will take about that long to drink the 30 or so bottles from a batch. Whites I age for 6 to 9 months. In your case, enjoy the first of your efforts, but put a couple of bottles aside for a year from now. Meantime, work on building inventory so it has time to age while you are drinking the first batches. Ed snipped-for-privacy@snet.net