D'you know if there's anything to do that last 1-4 hours, isn't costly and is close to the airport, especially if the person doesn't know a word of Polish? Yeah, loooooooooooooooooong lay-over...
Can't, don't have really anything good enough for browsing the web, and not all airports have computer you have to pay 12 euros/hour to use ;.;
Alright then. I'd recommend just walking around the city. Easily consumes a couple of hours. It's free, and you shouldn't need to know polish. (Also, though I don't know, I can't imagine it being too far away from the airport)