What is the approximate duration of the synodic period for Mars that allows for frequent launch windows?

Answer

About 26 months

The text specifies that the synodic period for Mars—the time until planets return to a favorable launch alignment—is significantly shorter than for outer planets, being about 26 months.

What is the approximate duration of the synodic period for Mars that allows for frequent launch windows?
Spaceexplorationplanetsolar system