I went to one back in March. My girlfriend was competing at it. 20 or so lifters, and it still took 5 hours. There were three lifters that just walked out part way through. It may have been that particular venue or Meet director, but it was a horrid show.
You may have better luck if it's a bigger USPA Meet, or a different director, though. Oh, and you'll be walking out that squat. So, If I were you, I'd bring spotters you trust.