I assume you are talking about a standard 3 x 3 cube?
My step son has every combination and shape up to a 13 x 13 and before you ask, yes he constantly solves them all.
He can do the 3 x 3 in less than 10 seconds, the 13 x 13 takes a little longer. I think his fastest time for that is around 1 hour 40 minutes.
My time for the 3 x 3 is approximately 50 years and still counting!