No. They didn't have enough time.
5 seconds sound clip from the My Cousin Vinny movie soundboard.
You can hear this line at 01:21:57 in the Blu-ray version of the movie.
Quote context
[...]
- Then two different men drive up in a similar...
- Two different men drive up in a similar-looking car, go in, shoot the clerk, rob him and then leave?
- No. They didn't have enough time.
- Well, how much time was they in the store?
- Five minutes? Are you sure? Did you look at your watch?
- No.
- You testified earlier that the boys went into the store and you had just begun to make breakfast.
[...]