You cant even reach the speed of light. Acording to relativit you would need infinity energy to be able to travel at the speed of light (which isn't possible).
I dont know if the answear to time travel is with time diations. If we acce with 3G (aka around 30 m/s2) it would take 1*10^8 s for us to reach the around the speed of light (doesnt include time diations now tho).