I was just there this morning. Waiting time ?,... zero.
They have three windows, if you see more than a few people, take a number.
Otherwise wait till they call you. Make sure you have your passport with you.
And a [background=rgb(252, 252, 252)]printout of the transaction with the transaction number. [/background]
You have to show a bank statement after drawing out a large sum of $$$ over many months.
I had to do that a while back, maybe once a year.
Here's a trick that will speed your transaction. When you log into the xoom account let's say you want to do U$D1.000.00 = ARG pesos $13.026.35
Instead of using the "send amount" in U$D,... use the "receiving amount" option that comes closest in Pesos $1.3000. 25.
It will automatically calculate the U$D amount. The trick is to leave the ¢.25 for the teller. It can be .15 ¢ or .20¢ (i.e. one penny or two US pennies !)
The tellers get paid once a month, those nickels & dimes you leave behind add up at the end of the month.
It's a little game,... like you're putting pennies into their piggy bank. Just don't ask to get the .15¢ or .¢20 pesos cents. That would be,... tres gauche !!!
After a while they'll remember you as the guy who leaves the change behind & will greet you with a smile & speed you through your transaction.
I only use the main office in Libertad & Santa Fe.
Good luck.