Safely meaning they wouldn't have to feel a G force over 2Gs. Assuming we had technology to reach any feasible speed under light speed. Also, how long would it be relative to Earth?
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A basic calculation is possible using these equations. Note that how long depends on whether you mean from the traveler's point of view or Earth's - time dilation. – StephenG - Help Ukraine Feb 06 '17 at 22:28
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Getting rid of G-force using e.g. strong magnetic fields perhaps also involving implanting magnetic materials in the body seems to be technologically trivial compared to the challenges of interstellar space travel. Such a technology could also allow for a spacecrafts to make a hard 100 G landing without the astronauts getting injured. – Count Iblis Feb 06 '17 at 22:48
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Also http://physics.stackexchange.com/questions/109776/how-long-would-it-take-me-to-travel-to-a-distant-star?noredirect=1&lq=1 – ProfRob Feb 06 '17 at 23:23