Whats the minimum that beer has to ferment?

U have to wait at least 3 months

Two weeks. But it really depends on the sugar.

This is the third basic brewing question I’ve seen from you.

You’re probably spending a couple hundred dollars on materials and equipment, and you’re doing something that will take anywhere between a month and five years to produce results, depending on what you try. And yet, here you are, asking a bunch of strangers for advice.

Don’t you think it would be a good idea to, oh, I don’t know, sit down and do some basic research, perhaps by reading a book or consulting one of the many home-brewing websites out there?

It depends on the style of beer, the temperature, the type of yeast, and the amount of sugar. Altering any of these variables changes the beer a great deal.

In general, you should ferment for at least a week for an ale, and at least a month for a lager. Pay attention to the temperature requirements for various yeast strains, because they impact the flavor of the beer, as well as the alcohol content.

You can also do secondary fermentation by adding more sugar after the primary fermentation, or simply moving the beer to a different fermenter (removing the trub) and letting it sit a while longer. It’s fun to ferment the same batch of beer for different amounts of time and see how it effects the character of the beer, if you have enough interest.

An excellent and free online source for home-brewing knowledge is John Palmer’s book, “How to Brew”. http://www.howtobrew.com/