Originally Posted by Budzien
I'm currently making one gallon batches of mead. How long should I leave them in the primary before racking to the secondary?
Use a hydrometer, that is the only definitive way to know if fermentation is done and it's ready to be racked into secondary.
Airlocks are just two way valves to let pressure out so your fermenter doesn't blow, it's not a reliable indicator of fermentation. It will give you an idea when to start taking gravity readings.
Once you get get a few readings that are the same with at least a few days inbetween them then you know fermentation is done and that'd be the appropriate time to transfer into secondary.
There are a lot of factors that can effect the speed of fermentation ie: temp control, aeration and nutrients schedule, pitch rate, etc. So it's tough to put an accurate time frame on it.