I just got back from Las Vegas last night. We left Thursday evening around 6:30. For our departure we had to wait about 20-25 minutes in the Customs line, and another 30 or so for security. On arrival this morning at 12:30 am, we had to wait about 15 minutes in customs.
It's definitely not crazy though. If you get to the airport 3 hours before you flight leaves, you'll have lots of time to sit around and have a drink / coffee. 2 Hours before your flight leaves should still get you through without being pressed for time, but I don't like leaving things up to chance. It seems customs and security all use one line for outbound flights, so if there were 5 or 6 flights leaving at similar times, you could be waiting a lot longer.
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