FWIW
I have my students train their stances like so:
Horse: 30 seconds
Hill Climbing, Lt/Rt: 15 seconds each side
Cross/Twisted, Lt/Rt: 15 each side
Crane: 15 each leg
Cat: 15 each leg
I only require them to be able to add 10 seconds to the horse and 5 seconds to the others every 6 months or so. Naturally new folks aren't as low as they should be so the goal over the first 6 months is to really get the proper form and depth of stance. Then add time later.
oh, and the time increase goes up as well later on.
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