I have a recipe for an amber ale that I usually let ferment for 4 weeks and then use the set it and forget method of carbing in the keg for 3 weeks. However, swmbo had some of her friends over and this keg is now empty and I need to have at least 3 gallons ready to drink 5 weeks from today for our son's first birthday celebration.
Thus, I was thinking of making a 5 gallon recipe where I was thinking that if I keg 3 gallons (and bottle the remaining 2) that the time for the kegging for three gallons might be OK for 2 weeks instead of 3 weeks.
Question remians is will 3 gallons of beer absorb CO2 faster and more effectively than 5 gallons if I use a 5 gallon keg? Will this empty space (purged of O2) help or hinder this process?