You think you’ve got problems.
I have a mechanical auto-wind wristwatch made in Switzerland. It has a nominal daily rate of 1 to 1.5 seconds advance when I’m at home or at work.
When I stay at my riverside caravan, it’s daily rate mysteriously changes to 1.5 to 2.0 retard.
When I’m riding round, I haven’t a clue whether it’s advancing or retarding, so I’m really not sure what time I start or finish an Audax.
Riding a 300, my time for the event might be anything between -2 and +2 seconds wrong.