Despite, or perhaps because of Sandy Hook, CO saw record background checks for firearms over the weekend. The demand for checks was so high that wait times went from a few minutes to nearly a day:

A total of 4,154 background checks were submitted on Saturday, said CBI spokeswoman Susan Medina. Those figures topped the previous greatest number of background checks on Black Friday this year, when 4,028 were processed.

The surge after the massacre surprised CBI officials, who said the office wasn’t adequately staffed to deal with demand. The situation soon created a backlog and increasingly long wait times for potential gun buyers waiting for check results.

So many background checks were submitted the process that normally usually takes minutes turned into wait times of more than 15 hours.
“We had to call in extra staff,” Medina said. “The wait times were high.”
Because of the wait times, many would-be buyers went home without results. Medina said 3,001 of the requests were processed Saturday.
By Sunday, the wait for a processed background check grew to 18 hours, Medina said. By Monday afternoon, it took longer than 21 hours for a check to be processed.