Comment: Re:22 light years (Score 1) 288
Arbitrarily high accelerations are not needed. What is needed is sustained low acceleration. Sustained acceleration at about 1 G, accelerating toward the target for half of the trip, and away (braking) for the other half, will make a 22 LY trip take about 23 years (as seen from the departure/arrival points).
http://en.wikipedia.org/wiki/Space_travel_using_constant_acceleration