Most Company Ops Manuals require company Pilots to log Flight and Duties of a private nature to be included on ones workplace Flight and Duties.
Flight Time accrued on any aircraft that can be logged, must be logged in your appropriate log book, 28 and 356 day totals etc etc.
Where this gets quite inconsistent is with "Duty Time", in CAO 48 and the exemption to CAO 48, "Duty Time" is described in the definitions section of the order/approval as ( loosely worded ), "Hours the Company requires you to be at work, doing the Pilot thing or associated tasks ".
For example, going out hiring a C172 to fly over to Rotto to sip Latte's at Dome and eat greasy fish and chips with someone you're trying to tap, does not quantify as time the company requires you to do the pilot thingy, so,,,, good luck with that one. ( unless of course you are dating the sort of "ladies" youngmic would be dating, some would say that to be a duty
).