This isn't followed well enough to make it practical, though. If you aren't scheduled to begin work until 2 hours after the polls open, they say you have time. It doesn't matter if you cannot physically get to the voting booth, vote, and travel to work in the time given.

As far as absentee ballots are concerned, sometimes they are difficult to get. My mother had trouble getting one when she was pregnant - my sister was due around election day. She finally got it, luckily - because my sister was, indeed, born on election day.