Einstein basically in his theory of relativity said, "time is relative" – and when asked to explain his theory for a layperson he said – "When you are having an engaging conversation, a hour feels like a minute, and when you are sitting on a hot stove, a minute feels like an hour" – however this is when you are looking purely from a biological perspective (in other words, "pleasure is well, pleasurable; and pain is well, painful") but when you are looking from a soul, our true desire perspective, it goes like this "when you are wasting time, your life feels wasted; when you are doing something meaningful, your life feels meaningful" – these equations are to paraphrase Einstein "eternal."