A megasecond is one million seconds. This page lists times between 106 seconds and 109 seconds, which is about 11.6 days and 0.0317 years.
One megasecond contains 1000 kiloseconds. There are 1000 megaseconds in one gigasecond.
Ten megaseconds is equal to 115.74 days. One hundred megaseconds is equal to 3.2 years.