Gemini XI (space mission in Project Gemini)
September 12-15, 1966
Charles Conrad, Jr., Richard F. Gordon, Jr.
2 days, 23 hours, 17 min, 8 seconds

Gemini record altitude, 1,189.3 km (739.2 mi) reached using Agena propulsion system after first orbit rendezvous and docking. Gordon made 33-minute EVA and two-hour standup EVA. 44 orbits.

Source: NASA

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