How to pass time at work?

My work is seasonal i guess, so i get very bored working in dead days, even with my computer or iPhone, i do watch youtube browse the internet, still i get bored i can't surf the internet for 6 hours,
so any experiences, tricks, ideas to do in work?

Clean. Organize. Contact customers for reviews. Try to drum up repeat business. No idea since we don't know what you do.

Most businesses have things that need doing but can always wait. Identify some of those things and do them. Rick B's ideas are solid, if they apply to whatever it is you do.

Stock or supply room disorganized? That's pretty common, and a big job you can do a little at a time for months. Coffee station or office library hasn't been deep cleaned since the Carter administration? Do it. Files need to be alphabetized and put in long-term storage? Yup, that's you. Forms people fill out need to be updated to reflect new laws/situations/sensitivities? Redesign them.

If there's literally nothing work-related you can do, find good books and read for an hour at a stretch.

I know people who run minecraft servers while "working" and make extra money.

How to pass time at work? You do actual work. There's always something to do. If you love your work, make sure you don't get to be the seasonal worker. Work!

Do what you are getting paid for