I read this post prior to flying from San Salvador to LGA, with a connection in FLL. I'd like to update based on what I saw myself in September 2022.
This is the LEAST ORDERLY airport i've seen anywhere in my life, perhaps outside of Karachi, Pakistan Arrivals.
I had 2 hours, 20 minutes to make my connecting flight and I had no checked bags, and I got lucky on numerous occasions with new security lines opening up in front of me, but I still JUST made it to the gate in time to board.
Step 1- Get off plane and make it through Customs
-(30 minutes) If you have checked bags, you'll need to wait for them and pick them up and then get on way in the back of the Customs line. My guess is this adds at least 30 minutes.
-(60 minutes) I had no checked bags so I immediately got on the Customs line and stood there for about 60 minutes before I got to see an Officer.
-(20 minutes) If you are selected for screening of your bags, add another 20 minutes. I was not selected.
-(20 minutes) If you have checked bags, you'll need to recheck them right after getting out of Customs, downstairs, so add 20 minutes for that.
Step 2 - Go upstairs to go through TSA Security again
-(30-90 minutes depending on your morality) You now have to go through the least orderly process, rife for abuse. Once complete with Customs, go back up to the main entrance. In my case in Sep 2022, around 9AM, the line was so long that it went all the way outside the airport for another 100m, nearly to the next terminal. Here, folks being dropped off in taxis and buses, and cars simply joined the line (mob) wherever they felt most convenient. Others simply walked past the line and joined the middle of the line once it was inside the airport. The reason for this abuse is b/c airport security does not concern themselves with anything going on outside the airport. It's like a post-apocalyptic zombie land, with absolutely no guidelines or police, and thus, fully open for abuse. What I saw when I joined the back of the line was a line that didn't move for 30 minutes as people walk up to the front yelling things like "Awww helllz no" and "Psssh NOPE" and random people just smile at another random person in front of the line and simply join in. I saw no fights because no one wants to miss a flight and end up on youtube, I suppose.
Once you make it INSIDE the airport, the line through TSA security is relatively fast because people can't skip you, and it's a short space.
I'm a single male traveler traveling with a backpack and I did everything as quickly as possible, and was also not selected for additional screening. It took me 2 hours and 20 minutes to make it to my next flight. If you have a baby or child, difficulty walking, lots of bags, etc, you should probably set aside 3-4 hours for a connection through FLL.