Because he is married with children.
A Martian year is about 687 Earth days long or 668.6 Mars days long.
Mars' year is 687 Earth days long because it takes that amount of time for the planet to complete one orbit around the Sun. Mars is farther from the Sun than Earth, so it travels a greater distance in its orbit, resulting in a longer year.
The time to travel to Mars is approximately 214 days (Earth days of course).
214 days
683 days
1.025 days
687 days
A week is defined as a period of 7 days. So a Mar's week is also seven days. Curiously a day on Mars is only 24.622 Earth hours
198 days x
687 earth days
1
Deimos orbits Mars, not the Earth, and takes 1.26 days to do so.