Hey Nicholas, first off, thanks for the speedy reply

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The only command that we know our first parents disobeyed was the one given specifically to Adam, basically, "
don't eat that apple". We're not told how long Adam lived before Eve came along, or how long the two of them lived in the Garden before they fell, are we?
As for God's command to "
be fruitful and multiply and fill the earth", unlike the command concerning the Tree of Knowledge, this one was directed at progenitor and progeny alike. I may have missed it, but I don't remember a timetable associated with the fulfilling of that command, do you? If there is one, it would be an important thing to know, because that particular command was given to mankind in general, not just to our progenitors (as I just mentioned), so whatever was required of them would also be required of us today.
Yours and His,
David