Most is defined by the attributes you apply to it. During most of history, humans were too busy to think about thought. A determiner is a word, such as a number, article, personal pronoun, that determines (limits) the meaning of a noun.
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Why is most of history correct in the above sentence? Most is what is called a determiner. I've recently come across a novel called a most wanted man, after which being curious i found a tv episode called a most unusual camera.
Most of your time would imply more than half, the most time implies more than the.