Karma only lasts for the moment it is committed. I think what you mean is Vipaaka(result of Karma). Vipassana meditation appears to have the effect of hurrying the Vipaaka as you progress in it.
Apart from that, there's a category of Kamma called "Ahosi Kamma". If you reach the end goal of Vipassana meditation, all consequences of Kamma that is capable of resulting in rebirth becomes defunct.