Most single batch beers you've ever brewed in one session?

Two five gallon batches in a day is all I've been able to do, and I'm wiped out after that. I usually do that during the fall in prep for winter, as I don't do much brewing over the winter. Mostly though I just do one at a time.

 

One day I did seven 1-gallon experimental batches to investigate the flavor impact of different roasting times for home made toasted malt and home made crystal malt. I had 3 levels of roasting applied to straight base malt and 3 levels of roasting applied to homemade crystal malt. I did 7 mashes (3 roasting level x 2 malt types + 1 control with base malt only). and conducted boils on my stove top burners (3 big burners can maintain 3 1 gallon boils simulatenously).

 

Two, but only if they came from the same mash.

I am too ready for a beer by the time the boil starts.

 

I have also done 2 6-gallon batches on the same day on several occassions. Usually, I employ some sort of time saving step, like one big base malt mash, split between the two beers. Then I augment the differences between the two beers with steeping grains, different hops, and/or different yeasts. Once, maybe twice, I did two full-sized mashes for two different beers on the same day. I recall a 12-hour brew day that I would prefer not to repeat.

 

On my 35th birthday last Fall I brewed 35 gallons. 5 'different' beers. I mashed two different grain bills and sparged and boiled in three different pots. Each boil had different hop schedules and two had some steeping grains. I fermented in 5 different fermenters. I used different yeast strains depending on the style of each. Two of the five were dry hopped.I keg in 7gallon sanke's.

7gal English Brown Mild
7gal IPA
7gal Red Porter
7gal Citra Pale Ale
7gal American Brown

Each Beer is different even though they came from the same parents.

On a side yet related note - I hate leaving spent grains that can be rinsed a bit more for more beer. However, I usually never have enough to make it worth my time. During a homebrewer's day at a brewery last summer, I gathered their extras (1 gallon or so) from each participant. I blended, boiled and made a 'garbage' beer. It was surprisingly good. We all shared when we met back up a few weeks later.

 

You my friend are a madman...that is intense!

 

Only 2, but only during certain times of the year when the weather is right since I only can do temp control for 1 carboy at a time. Once I get my conical running I can do temp control on 2 batches, but I don't think I'll do 2 often. Lot of prep the night before as well.

 

My brewing partner and I have done 15 gallons, one 10 and one 5 before. A hectic but fun brew day for sure.

 

3 ten gallon batches, all different. Probably added about 5 hours max to the day, which is about double what I spend doing a single 10 gallon batch.

 

I did my longest brew day yesterday. 12.5 hours, 3 batches of all grain making 15 gallons. I made a Hoppy Pale Ale, Janet's Brown and Sanctification Clone.

 

That's the thing, it isn't a linear increase. Beer 2 is being mashed as Beer 1 is boiling, Beer 2 is going onto the boil as Beer 1 is chilling, and now beer 3 is going in the mash tun.

 

2 10 gallon batches.......
I'll be doing the same thing on Sunday. Brewing a Hef for a neighbors bday party and I figured since I had the gear out I might as well brew something for myself

 

Or you can do what I do and brew 2 all grain BIAB batches side by side simultaneously! Took 6 hours last time, but I only had 1 plate chiller so we needed to offset the batches by a little bit and we ran into a few unexpected delays. I'm fairly confident that with my recently acquired second plate chiller and a bit more experience at doing it, I could brew 2x60 minute boil batches (16 gallons produced) side by side in 5 hours including clean up!

 

I generally do one at a time for more focus on what's at hand,
but from time to time I will make a larger wort & separate it into
two different vessels so I can alter accordingly.
(different flameout hops, different yeast, spice/herb/fruit additions, etc.)
Or, after primary is done on a normal 5-gallon sized batch, rack beer into two separate carboys
for further experimentation.

It really depends on the style. If I'm brewing a darker beer I have a specific
idea in mind, & I strictly want 5-whole-gallons of that one beer.
To me, lighter styles lend more elbow room for experimentation.
To each his own, I suppose!

 

4 5gallon batches is the most ive done in one session. I find two batches per session to be the magic number for me.