The distance of Altair is listed as 16.8 light-years.
That's something like 1.1 million times the distance from the earth to the sun !
About 8 minutes
Several thousand years.
Roughly [8 and 1/3] minutes.
It tells us whether a star (or galaxy, or other object) is moving towards us, or away from us; and how fast.
The closest distance of earth and neptune is 4.301 billion kilometers and the farthest distance of earth and neptune is 4.553 billion kilometers. So, the time to reach Neptune ranges from 8.602 hours to 9.106 hours.
About 8 minutes
2 to 6 weeks
It takes around 15 hours
Polaris (North Star) is about 433 light years from us, so that is how long light will take to reach us.
7-15 Days
Approx. two weeks.
1 to 14 days or more
it takes about almost 4 months.
Several thousand years.
Not for the stars you can see without a telescope. All of the stars you see at night are within a few hundred light years of Earth, so it does not take the light more than a few hundred years to reach us. There are stars in other galaxies that are millions or even billions of light years away. That light does take millions to billions of years to reach us, though the stars are too far away for us to thee them individually.
anywhere from 1 week to 2 months
1 to 14 days or more