How long to boil and when to add hops?

[brad26]

I am brewing an AG IPA, and I just finished batch sparging and have 8.5 gallons in my boil kettle. How long should it take to boil off 3.5 gallons and when should I add the hops, at the beginning of the boil or at the estimated time when I think there will be sixty minutes left in the boil?

 

[Dunerunner]

For boil off, as long as it takes.

For the hops, since I don't know what you have; put half in at the start of the 60 minute boil and add the other half 10 minutes before the end of the boil.

 

[breez7]

Put a fan blowing on your boil kettle it will really reduce your boil off time. I would try and end up with 6 gal at the end of your 60 min boil, you are going to have more break material doing all grain than doing an extract batch.

 

[Got Trub?]

The bittering hops go in when you are 60 minutes from flameout. Do not add bittering hops at the beginning of what could be a 2-2.5hr boil, they develope off flavours you don't want.

GT

 

[Chuck_Swillery]

You add hops for bittering, flavoring, aroma.

Assume you have a 60 min boil time. The first hops you all will go in from start of boil (60 min) to 30 min ... this is where the vast majority of your bittering will come from. From around 30 - 5 minutes you get flavoring. The final 5 to flame out you get aroma... generally. There is some overlap and you will get some flavoring from all parts of the boil as well as aroma. I've hopped at 60, 45, 30, 15, 10, and 2 minutes in a beer, IPA, and had it turn out great. It all depends on what you want from the beer - that will help determine when you'll want to add.