If light (as in photons) were in a vacuum, it would travel forever in a given direction.
In reality however, it is far more probable that light will experience disturbances (absorption, reflection, refraction, etc..) as it moves through space - thus, it's distance of travel is limited to some finite distance. I do not think that there is any good estimation for this realistic finite distance. Clearly, this finite distance depends on the situation of the light being transmitted, direction and regions of space through which it will travel.
add Recent observations of distant red-shifted astronomical objects indicate that their light was first emitted about the time of the Big Bang. So forever is a fair approximation. [Multiplied by the speed of light of course.]
In a vacuum, from one end of the universe to the other, unless it is obstructed by matter or trapped in a gravity well (black hole).
As far as light can travel
How far does light travel in one hour
light travels 300,000km
There are more things for the light waves to bounce off of in water, so light can not travel in a straight line or as far.
Infrared light is just light of a specific wavelength it can travel as far as any other wavelength of light.
It can travel about 5.86 trillion miles in one year. This is a light year.
how far u can travel at the speed of light in a year
It is the equivalent of how far light can travel at the speed of light in one year.
Light travels about 300 attometers in one yoctosecond.
About 5.6 miles.
88,179,380,597,754.15 miles
3,725,647.941 miles.