Hi the

It depends on where on the earth you live, i.e. your latitude and the time
of year.

At the equator the length of twilight is much shorter than at mid-latitudes
such as Europe or USA.

"Moon River" wrote in message
newswM_c.67610$S55.10721@clgrps12...
How long after sunset can you pick out Polaris with the unaided eye for
polar aligning?
The best I seem to do is almost an hour or 50 minutes after sunset.