That means it would take 1,351,351.35 years, using data from the (thus far) fastest manned spacecraft. As others have touched on, proposed spacecraft can travel faster. exobio says. I think Project Orion (nuclear powered spaceships) can hit up to 10% of the speed of light so that means 500 years, I think.
Medicine and Healthcare. Adults should be vaccinated with the TDaP vaccine (for tetanus, pertussis and diphtheria) every 10 years, maybe less (it is not going to be harmful to vaccinate more frequently). For diseases like whooping cough (also called pertussis), the danger to adults may be as serious as it is to children.
1 The CDC recommends that adolescents receive a dose of Tdap vaccine between 11 and 18 years of age, but preferably when they are 11-12 years of age.  It's recommended that adults get a tetanus and diphtheria booster (called Td) every 10 years and substitute a dose of Tdap vaccine for one of these boosters111.