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Megasecond Facts for Kids. Kiddle Encyclopedia.
A megasecond is one million seconds. This page lists times between 10^{6} seconds and 10^{9} seconds, which is about 11.6 days and 31.7 years.
Ten megaseconds is equal to 115.74 days. 100 megaseconds is equal to 3.2 years.
Less than a year
 1.21×10^{6} seconds = 14 days – a fortnight
 1.38×10^{6} seconds = 15.9735 days – half life of vanadium48
 1.54×10^{6} seconds = 17.81 days – half life of californium253
 2.36×10^{6} seconds = 27.3217 days – sidereal month
 2.39×10^{6} seconds = 27.7025 days – half life of chromium51
 2.42×10^{6} seconds = 28 days – length of February in nonleap years
 2.51×10^{6} seconds = 29 days – length of February in a leap year
 2.59×10^{6} seconds = 30 days – length of the months April, June, September, and November
 2.68×10^{6} seconds = 31 days – length of the months January, March, May, July, August, October, and December
 4.45×10^{6} seconds = 51.5 days – half life of mendelevium258
 5.23×10^{6} seconds = 60.5 days – half life of californium254
 6.68×10^{6} seconds = 77.27 days – half life of cobalt56
 7.24×10^{6} seconds = 83.79 days – half life of scandium46
 7.54×10^{6} seconds = 87.32 days – half life of sulfur35
 7.60×10^{6} seconds = 87 days 23.3 hours – one orbit of Mercury around the Sun
 8.04×10^{6} seconds = 93.1 days – half life of thulium168
 8.68×10^{6} seconds = 100.5 days – half life of fermium257
 128.6 days  half life of thulium170
 138 days  half life of polonium 210
 224.701 days  one orbit of Venus around the sun
 271.79 days  half life of cobalt57
 280 days  normal length of a human pregnancy; about 24 million seconds
 330 days  half life of vanadium49
 333.5 days  half life of californium248
  The value of pi times 10^{7} seconds is sometimes given as an approximate year value; it works out to 363.61026 days.
More than a year
 365 days  a regular year in many solar calendars; about 31.53 million seconds
 365.2425 days  the normal length of a year in the Gregorian calendar
 365.25 days  the normal length of a year in the Julian calendar
 366 days  a leap year in many solar calendars; 31.62 million seconds
 373.59 days  halflife of ruthenium106
 396.1 days  halflife of neptunium235
 462.6 days  halflife of cadmium109
 1.88 years  one orbit of Mars
 1.92 years  half life of thulium171
 3.3 years  half life of rhodium101
 4 years—full term of the President of the United States
 4.37 years—the amount of time it takes for light from Alpha Centauri to reach Earth
 5.2714 years—half life of cobalt60
 6 years—full term of a Senator in the United States
 10 years—one decade = 3.16 × 10^{8} seconds
 11 years  sunspot activity cycle (7.5 to 11 years)
 11.87 years—one orbit of Jupiter around the sun
 12.27 years—the amount of time Nazi Germany existed
 13 years—the normal time is takes to complete K12 education in the United States.
 13.08 years—half life of californium250
 16.13 years—half life of niobium meta state Nb93m
 18.03 years  Saros cycle, the period of solar eclipses and lunar eclipses
 29 years—the longest a dog has ever been known to live
 29.1 years—half life of curium243
 29.458 years—one orbit of Saturn around the sun
 35 years (1.10 × 10^{9} s) – The youngest a person can be and become the President of the United States
 36 years (1.14 × 10^{9} s) – the longest a cat has ever been known to live
 63 years (1.99 × 10^{9} s) – halflife of titanium44
 65 years (2.05 × 10^{9} s) – a normal age for retirement
 68.9 years (2.17 × 10^{9} s) – halflife of uranium232
 74 years (2.34 × 10^{9} s) – the amount of time communists controlled the Soviet Union
 75 years (2.37 × 10^{9} s) – average life span of humans in the First World
 84.3 years (2.66 × 10^{9} s) – one orbit of Uranus around the sun
 100 years (3.16 × 10^{9} s) – one century
 100.1 years (3.16 × 10^{9} s) – halflife of nickel63
 165 years (5.21 × 10^{9} s) – one orbit of Neptune
 190 years (6 × 10^{9} s) – age of the oldest known tortoise
 247.7 years (7.82 × 10^{9} s) – one orbit of Pluto around the sun
 269 years (8.49 × 10^{9} s) – halflife of argon39
 310 years (9.8 × 10^{9} s) – one orbit of Makemake around the sun
