According to our current scientific understanding, the speed of light in a vacuum is considered a constant, denoted by "c." It is approximately 299,792,458 meters per second. This means that the speed of light does not change based on the distance from its source.
However, your question seems to touch upon the concepts of special relativity, which suggests that time can be influenced by the relative motion between observers. In special relativity, the speed of light is considered constant in all inertial reference frames, regardless of the relative motion between the source of light and the observer.
One consequence of special relativity is time dilation, which means that the perception of time can differ for observers in relative motion. For example, if you were moving at a significant fraction of the speed of light relative to another observer, you would experience time passing more slowly compared to the stationary observer. This effect has been observed and verified through experiments involving high-speed particles and accurate timekeeping devices.
It's important to note that time dilation is a relativistic effect that occurs due to the constant speed of light and the nature of spacetime. It does not imply that the speed of light itself changes based on the distance from its source.