.1 c is so slow that the difference is negligible. But, since you asked, that's 44 years as experienced by somebody in the spacecraft, and 44.22 years as experienced by a stationary observer.
And to the person asking about g-forces, g-force generally refers to the forces experienced due to acceleration. There are g-forces anytime an acceleration occurs. I am guessing that you confused this concept with gravitational force. However, gravitational forces are also present- although are generally much smaller than here on earth- in space.