Did you get a satisfactory answer to this? I am confused too. My self employed home office where I see clients was closed due to covid from March through the rest of 2020. During that time I collected PUA unemployment income and did not have any earned income. My business is still "in business" but was closed temporarily. I still had the expenses of keeping a home office prepared for reopen at any time as soon as it felt safe. I don't know how to answer the question of how many months I used the office at least 15 days of each month.
