I would think that you might do it for 20-30 minutes on high. Just curious but how long would you cook a whole chicken in the oven? I would divide the time up that way since it's 30 min to do the chicken in the microwave. I've never done a whole chicken in the oven so I can't give you the breakdown. I hope this helps. Good luck!!
I've been trying to find a formula myself for converting regular recipes to the microwave. I just did ground beef in it last night and it turned out better than when I do it on the stove.