The revelry following the Blackhawks’ late-night Stanley Cup victory in Boston on Monday night may have cost Chicago millions.

In an interview with CBS 2, executive outplacement firm Challenger, Gray & Christmas CEO John A. Challenger said up to one-quarter of the city’s workforce was tardy or playing hooky on Tuesday morning.

“In Chicago, 25 percent of the workforce is coming in late,” Challenger said. “We see millions of dollars in productivity losses.”

The figure isn't precise. Challenger spokesman James K. Pedderson told International Business Times on Wednesday that the number was a “rough estimate.”

“Those aren’t hard numbers,” he said in a phone interview, “but obviously in general you’re looking at people not coming into work.”

He added businesses that tap their customers en route to the office – cafés or lunch bistros, for instance – likely suffered. However, Pedderson said the firm doesn't quantify exact daily productivity numbers.

But Challenger said up to $242 million may be lost for every 10 minutes of unproductive work time.

The Blackhawks beat the Boston Bruins at TD Garden 3-2 in the final round of the Stanley Cup, the National Hockey League's top tournament.