[Elsie]

Mars takes 686.98 Earth days to complete an orbit around the Sun.

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[FreedomCalls]

Mars takes 686.98 Earth days to complete an orbit around the Sun

So somewhere around the first of August we will cross behind the Sun to the opposite side from Mars. The mission will have to terminate at that point, unless the rovers can survive a 60-day or so loss of communications. So I don't think we can make it to a 200-day mission.