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