I usually rotated more or less every 30 days. I no longer really keep a schedule. Some people report Wormwood gives them problems when taken too long. I often took Wormwood for more than 30 days.
My maintenance is 1 tbsp of home made Black-Walnut tincture per week. 1 level tsp of olive leaf. 6-8 lbb and maybe a couple days of a homemade mix of herbs. I also like to eat fresh garlic often.
Everyone has a different opinion of rotating herbs. I would start with the Hulda Clark dosing of Black-Walnut , Wormwood and cloves. Can't go wrong with these 3 herbs.