Keep an eye on that Miami-Dade County Elections Department website listing wait times. I early voted downtown today at the Elections Dept. (Stephen P. Clark Center), 111 NW 1st Street (Metrorail station). Very well run system, especially considering that I arrived at a lunch hour rush time.
I was in the door at 12:18, was out of there by 1:25 PM - Just over an hour, including the time to prepare and cast my ballot. The County Elections web site curently lists the wait as downtown as 1 hour.(3:40 PM)
I am hearing that Coral Reef Library is currently a three hour wait today. The wait is currently listed on the County web site is 2:30.