Can only speak for the variety I grow. Plants are dried outdoors on wire racks which are elevated off the ground. They are loosly covered with cardboard and then tarped. Air flow is from the bottom up. The racks are on the north side of a storage building. There is room to dry indoors but ventilation is lacking. Usually 3 weeks dry time is enough. Bulbs are cleaned, necks trimmed and then placed in shallow crates to cure at 60-65 degrees.
I grow a few hundred lbs., virtually all is sold and used as next years seed. What is saved for personal use stays in excellent shape for 6-8 months. It then begins to lose weight, developes a green core and has a stronger taste. We still use it from harvest to harvest.
The keys to long term storage is the variety grown, a slow dry down and curing at cooler temps.
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