Charity · 56-60
This a article indicates 50 years would have passed for a 5-year trip traveling at 99.9s the speed of light
https://www.calendar-uk.co.uk/frequently-asked-questions/how-much-time-would-pass-on-earth-if-you-traveled-at-the-speed-of-light
https://www.calendar-uk.co.uk/frequently-asked-questions/how-much-time-would-pass-on-earth-if-you-traveled-at-the-speed-of-light