Is it because of the whole big head/bipedalism thing? Other mammals can pop out babies in no time and it seems like that would be way more advantageous for multiple reasons (less stress on mom and baby, not in a vulnerable position for hours in the wild, etc). Why does the norm skew towards a day rather than hours?
In: 419
In addition to what others have said:
Humans have a high success rate for reaching adulthood. There is no environmental pressure for us to mass-produce offspring (in the hopes that one makes it to adulthood). In other words, slow reproduction rates did not hinder our ancestors.
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