The period of time that you lived in the home on your own is not considered at all. You did not have a rental property until you decided to make part of your home available for rent and you began to advertise it to find a tenant.
If you used that rental space for personal purposes after you began to advertise it and before your tenant moved in, then you would count that time as personal use days. Typically, there would be no personal use days because the space would be ready for a tenant or used by your tenant and not by you.
When you are entering your information into TurboTax, be sure that you check the box saying that you rent out part of your home and that you converted it from personal use to a rental during 2021.
@RichardMMMM
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