According to several reputable sources, Sergei Avdeyev holds the current known record for time travel by a human being. In his over 748 days aboard Mir (cumulative across three missions) he went approximately 17,000 mph and traveled roughly 0.02 seconds (20 milliseconds) into the future, which is considerably more than any other human being. A common misconception is that the Apollo astronauts hold the record -- they did go faster than Avdeyev, but they were only in space for a few days.