Since I am 35 weeks pregnant I asked the voting office are there accomidations for people who can't stand up very long. I give myself 5mins tops.. They actually let me vote from my car! They have a portable voting machine available to bring to people who can't wait in line. So if you are concerned you may not be able to vote and didn't get your absentee ballot in.. I would call the voting office and see if they will allow you to vote from your car or at least let you get in the disabled line.
Hope this helps!