"10 By the which will we are sanctified through the offering of the body of Jesus Christ once for all.
11 And every priest standeth daily ministering and offering oftentimes the same sacrifices, which can never take away sins:
12 But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God;" (Hebrews ch. 10)
Once for all means only one time, for all . He didn't then travel to Mars and repeat, or to Saturn and do it again. He only did it here on this terrestrial plane.