Corrected entry: There is a time problem in the first part of the movie. Thelma and Louise get to the Silver Bullet bar just as it is getting dark, which at the latest could have been at 9 p.m., if the movie was set in summertime. The events happening inside the bar are all shown in real time, and no more than 10-20 minutes later Harland gets shot and the women speed away. Then they stop by the side of the road, change drivers, and stop at a diner where Louise calls Darryl - which we later learn was at 4 a.m. That's a 7-hour stretch to do only those things.
Krista
18th May 2004
Correction: The events in the bar are not in real time. We see Thelma and Harland dancing to several different songs, a purposeful indicator of time passing. Thelma also ends up getting plastered, which would have been difficult to do in just a few minutes. And finally, Louise later says that no one will belive Harlan tried to rape Thelma, because everyone saw her hanging on him all night. It's safe to assume they were at the bar for several hours.
Krista
They are not shown dancing to several songs; they are dancing to one song, "Tennessee Plates." ("Badlands" doesn't cut in until Thelma's done dancing.) And it's not hard to get plastered if you down two shots of alcohol in less than five minutes, which we see her doing. Louise's expression "all night" is just that: an expression. And even if they danced at the club for a whole hour - unlikely, given how much Louise wants to get going and how little fun she's having with her dancing partner - that still doesn't account for all that time.