As long as you're not pulling directly into your driveway from the
Interstate, you'll be fine. I suspect that most of us have at least a
few minutes of slow driving while getting into our neighborhoods, so
that would do it as well. It's not so much the idling, it's the 'not
using the turbo' prior to shut-off that is important.
'04 A4 1.8Tq MT-6
Central NJ USA