Rounding the minutes when logging, is it legal?

Only if your truck goes from 0 to 60 in mere seconds. In reality, it adds about 15 minutes to your drive time each time you stop/start.

 

Roadkill,

The scenario I posted is splitting hairs. But it is a valid scenario if you get into something close to where you started from. Naturally, the farther away from the starting point, the less the errors will show.

I know I can be up to speed in less than a minute when leaving a rest area. That leaves another 10 mins of 60+mph travel before he shows even moving.

If the poopoo strikes the rotary oscillator around the same time, it's going to be tuff to explain how you got several miles down the road before your log book says you started.

Suppose he's involved in an accident just outside the T/S lot. His book shows he hasn't left the T/S for another 10 minutes or so. Hard to justify to the cops. It qualifies for logbook falsification.

If nothing happens in that time, great for you.
You won't have any trouble.

Personally, I try to never underestimate the power of stoopidity if I can help it. "It" happens!

Besides, it's one of Murphy's laws.

"If anything can possibly go wrong, it will go wrong, at the worst possible moment."