It’s that time of year again – time to duck and cover at the office ... and assemble your fantasy football team without your boss realizing you’re wasting company time.

Well, according to a new study, you fantasy football guys out there are wasting company time to the tune of more than $13 billion.

Consulting firm Challenger, Gray, and Christmas admits that it’s crazy to try to figure out how much work is lost because of fantasy football – but they made a run at it anyway.

They figure that 18 million working people play fantasy sports – and those team owners spend an average of two hours a day working on their team or teams instead of their job.

Over a 15-week fantasy NFL season, that’s a staggering $13 billion.

But anyone who’s enjoyed the thrill of a solid season of fantasy football knows that it’s well worth it – even if it is destroying our national economy