How long does it take to reach the speed of light at 1G acceleration? The equation for acceleration is a = (v-u) divided by t. a = acceleration = g = 9.8 m/s/s v = final velocity, which in this case is the speed of light=300,000,000 m/s u = initial velocity=0 t = time 9.8= (300000000 - 0) / 't' 9.8 X 't'= 300000000 't'= 300000000 / 9.8 time to reach the speed of light at 1G = 30612244.9 seconds or about 353 days... I have been experiencing 1G acceleration all my life, well over 15,000 days...so I feel I am entitled to the distinction of being in a state faster than the speed of light. I don't know about you folks. So, maybe someone can enlighten me, please.