For the gardeners: How long, starting from scratch, should it take to obtain Thavnairian Onions assuming you have 3 gardening beds to work with? How many Thavnairian Onions have you procured since patch 2.3 went up? With how many beds?

I've had some success getting an answer to this question in the gardening threads but I'm just looking for a few more sources to make sure my information is accurate.