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There's several ways to approach the problem, depending on what kind of year you're interested in. If it's a calendar year, then an exact answer is possible: each day is 86,400 seconds and each year is 365 days (except for a leap year, which is 366). This gives a result of 63,072,000 seconds in two years, 63,158,400 if one of them is a leap year: obviously both can't be leap years at the same time. The calendar year is the year to watch if you're interested in actual timekeeping. For example, if you start a timer at midnight between December 31 and January 1 one year, and stop the timer two years later, the above answer is the one you'd end up with (though the timer would probably overflow by then). You could also be interested in two years from an astronomical point of view: how many seconds it takes for the Earth to make two complete revolutions around the Sun. There's slight ambiguity in what we mean by "complete revolution," but one common measure is the sidereal year - a complete revolution from the point of view of a hypotherical observer on a distant star. It is approximately 31,558,149.54 seconds long, making the length of two years slightly over 63,116,299 seconds.

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