Is that 3 years from your frame of reference?
At the speed of light, time dilation becomes infinite, meaning that for each instant in time you experience, those at rest with respect to you would experience an eternity.
To find the change in time (taking relativity into account), we can use this formula relating "time propper" with "time",
(delta t) = (delta t propper) / sqrt (1 - u^2/c^2)
where (detla t) is the change in "time", (delta t propper) is the change in "time propper", u is the objects velocity, and c is the speed of light.
You can see that as u approaches c, the sqrt() term goes to zero and the overall equation becomes infinite.
If you call "time" the time experienced on Earth and "time propper" the time you experience while traveling at the speed of light with respect to Earth, then "time" blows up to infinity.
If you reverse it and think of what people on Earth would experience while watching you fly away at the speed of light, They would be watchinng a seeminly "frozen" spaceship since time Earth.
Both you in the spaceship and those still on Earth would experience time like normal as it was different since both groups of people are at rest with respect to themselves.