Manned mission to Mars
Wikipedia
Author	Year of proposal	Year of flight	Flight Earth Mars	Stay on Mars	Weight on LEO [ton]	Number of astronauts	Number of Mars ships	Number of launchers
Werner fon Braun	1956		9 months	2 years	3600	12	2	40
Koroljov	1962		9 months	2 years	1600		1	20
Sohn	1965	1982	9 months	2 years	1000	6	1
Zubrin	1991	1996	9 months	2 years	220	4	2	2
NASA DRM 1.0	1993	2007	9 months	2 years	850	6	4
NASA DRM 3.0	1998		9 months	2 years	500	4	3
NASA DRM 5.0	2007	2029	9 months	2 years	900	6	3	8
SpaceWorks	2007	2033	9 months	2 years	500	3	3	5
Ajgl	2007	2050	9 months	2 years	1000	2	4	8
Musk ?	2020	2026	3 months	10 days	1500		1	10