When answering this question, you must consider only the portion of your house that is being rented. It is its own separate rental entity. Therefore you will only have personal use days for the rented room if you used that space during the time it was not rented.
Given your question saying it was rented for 10 months, your personal use time cannot exceed 2 months. The personal time would be even less if the room was converted to rental use during the year. Any time that the room was advertised as available to rent but remained vacant is not considered personal use unless you did actually use the room during the vacant period.
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