if you have access to a greenhouse, two generations/yr is easy, three is possible. If you are advancing generations on early filial generations (i.e. F2-F4), you will need to be careful to advance multiple progeny per generation to manage "genetic drift", unless you are prepared to accept that risk, such as with a single seed decent strategy. When I employ a 2/3 generation/yr strategy to fine tune F5-F7 lines, I normally go with just a couple of progeny per line, and confirm uniformity. There is still some risk, but I believe it is properly balanced with the goal of "fixing"/stabilizing the inbred genotype.
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