Assuming terrain-optimized multipedal robots, with stereoscopic vision across a broader range of the light spectrum than human vision: less time than with human

Assuming terrain-optimized multipedal robots, with stereoscopic vision across a broader range of the light spectrum than human vision: less time than with humans. Such robots should be available in the same timeframe as a human-supporting infrastructure could be delivered to the Martian surface. (In fact, building that infrastructure might require similarly-advanced robotics.)