Poland's daily GDP is five billion zlotys. If you consider that the loss in productivity was 10 percent and that 10 percent of professionally active people are interested in football, you get that figure.
Note. More on this,
Note2. Another take on the 10 percent is here,
"Psychologists and labor production experts estimated that each Polish football fan spent at least 15 minutes discussing Sunday's match, and the frustration of defeat lowered productivity by at least 10 per cent."