Originally Posted by JonM
Tried a little experiment last night. Bottom line is this - one AG batch takes 4 or 4.5 hours. I did an extract batch AND an AG batch and the whole thing took a mere 5.5 hours. 100% more beer for roughly 20% more time and effort.
I did the extract batch first. Steeping the grains and bringing the extract batch to a boil took about an hour. About ten minutes into the 60 minute boil, I started heating up the strike water for the AG batch. (Yep, you need two buners to make this work). Did the 75 minute mash while the boil and chill for the extract batch were on, and then heated up the sparge water while whirlpoolling the extract batch.
As soon as I poured the extract batch out of the kettle and into the fermenter, I gave the kettle a quick rinse and drained the mash tun and proceeded with the AG batch as usual. Like I said above, 100% more beer for about 20% more effort.
What batch size? It takes me 6 hours to do a 10 gallon AG batch. Fly sparging takes a while, and I usually do 90 minute boils.