If your company has an exemption from Flight and Duty Time Limitations, then check with that. Our latest exemption now refers to private operations.
"Private Operations
Calculations of flight and duty time limitations made under the provisions of this schedule shall take into account ant flight and duty time performed in the course of private operations."
I would suggest that you should record private flying duty time, this would ensure that you do not exceed any limits, and get the required breaks or days free of duty.
Cheers,
Capt EFIS.