Get submitted value of a select list error on #options - Drupal 7
Thanks to tenken and Clive I was able to figure it out.

$key1 = $form_state['values']['field_setup_time3'];


This line outputted as a string. Since I was only using integers in my select list, the label and key value were the same. I removed both lines of code and replaced it with this (after some playing around with devel):

$reservationStartPadding = $form_state['values']['field_setup_time3']['und'][0]['value'];


This outputted the value as a number and not as a string. I was able to use it from there in my future code correctly.