As a Canadian citizen what is the longest I can stay in Poland without a Visa.
90 days. Full stop. End of story.
I read somewhere that it was 90 days. If I leave the country and then come back in again do I get another 90 days. If so how long do you think I could do that for?
You can not do that. You will either be denied re-entry or deported. You can only spend 90 days in any 180-day period in Poland.
If you don't believe me, search for posts by lowfunk99: he was deported recently for doing visa runs every 90 days.