How sensitive you are to carbs, i.e. how much you need to function and not feel like absolute crap is something you need to experiment with, but probably a good place to start would be:
hi carb day: 200 g complex carbs
med carb day: 100 g "
low carb day: 0-50 g " (this doesn't mean no green fibrous carbs tho--- veggies really don't count but keep them to the green leafy ones, not high sugar ones like carrots, peas, etc.)
Consider the "hi carb day" to be a refeed of sorts and run your low carb days either one day or two days - depends again on how intense your physical demand is and how you feel. IMO unless you are deep in contest prep, you dont' need to run the low days at crazy aggressive levels because you may want to run the carb rotation for awhile and its hard to function in daily life if your neuron firings are getting fuzzy and you bite off people's heads for stupid little things.