LeadSled's post reminds me - if CASA get bloody-minded, each occurrence your Log Book does not reflect the actual recordable flight time as per the CAO is a separate offense.
Is it worth risking fifty or more criminal charges for fraudulent Log Book entries, each 0.1 hour?
A reliable time piece is less than one hundred bucks. Isn't your flying career worth that small investment?
I recall one of the charges initiated by CASA against an AOC holder was a 3 hour overrun on a 100 hourly inspection, due entirely to a self confessed innocent pilot error in addition on the MR. And CASA discovered the error some 300 airframe hours (and 3 hundred hourly inspections) later.
It does not matter what your Ops Manual states. Where an Ops Manual states or implies anything contrary to the Act, Regulations or Orders, the Act, Regulations or Orders prevails.
The law is ..... well,
the law! Knowingly or unknowingly vary it at your peril.
The same questions about Log Book entries comes up time and time again on PPRuNe, every year for the past 12 or 13 years to my knowledge.
Log Book Forgery
Time entries for a logbook when there is no VDO
Fake instrument flight time logged
And those three are only in 2010.
I think the subject has more than been done to death?