The primary 4 Mercury flights are greatest understood as two pairs of flights. The primary two flights have been suborbital, with Alan Shepard changing into the primary American to fly in house (Could 1961), with a length of quarter-hour, 28 seconds, and Gus Grissom corroborating this flight (July 1961), flying for quarter-hour, 37 seconds. In February 1962, John Glenn turned the primary American to orbit the earth, finishing three orbits in 4 hours, 55 minutes and 23 seconds. On Could 24, 1962, Scott Carpenter duplicated this flight, additionally orbiting the earth 3 times, with a flight of 4 hour, 56 minutes and 5 seconds. Subsequent flights would lengthen the astronauts’ time in house, with Wally Schirra finishing 9 orbits in October 1962 in simply over 9 hours, and Gordon Cooper finishing 22 orbits throughout his 34 hours in house.