Driver CPC, new guidance

Zac_A:
Common sense is a very rare commodity, plenty of evidence available to support that.

Here’s a freebie you might not have had had on your DCPC courses: If you’re going to do 15’ plus 30’, then you really ought to be aiming for 17’ and 32’. The readout on the tacho is not necessarily the same as what is recorded on the chip inside the tacho, eg readout says 45’ of rest, but it might mean you’ve just begun your 45th minute and have only completed 44 minutes. It might not seem like much but in the event of an incident where someone is injured or even killed, the court will hear that “on the day of the crash the driver had taken insufficient rest.”

That’s what we all do at work, but only 16 and 31. Because it’s rounded to the nearest whole minute. How can 16 and 31 ever be rounded down to 14 or 29?
So is 17 and 32 needlessly cautious?