approximately 8.33seconds
Without light and heat Earth would be a dead and frozen planet
From Earth it would be the Sun, which, however not a planet, but a star
We would warm up and die as a planet.
Easy answer: it would take 72 years.
The closest planet to our sun in our solar system is Mercury.
If electromagnetic waves did not reach Earth from the Sun, the planet would be devoid of light and warmth. This absence of sunlight would prevent photosynthesis, disrupt the planet's climate balance, and likely render most life forms unable to survive.
It would take 100 Earth years for a signal to travel from a star located 100 light years away to reach Earth.
8 hours
Light travels at about 300,000 metres per second. The time taken for that light to reach us would depend on the stars distance.
Polaris (North Star) is about 433 light years from us, so that is how long light will take to reach us.
If the sun were to suddenly stop shining, it would take approximately 8 minutes and 20 seconds for people on Earth to notice, as that is the time it takes for light from the sun to reach our planet. We would experience darkness and a significant drop in temperature when the sunlight ceased to reach us.
Approximately 1.5 seconds.