With one email a/c, I have been able to vote around 20 times. It's definitely more than 10 times. You keep voting with one email account UNTIL IT TELLS YOU YOU CAN NOT.

They WILL tell you when you can not vote any more, so don't stop until you see that message.

Then use another account, your gf's bf's husbands's brothers whatever, or any a/c at all...and start all over.

When done, rinse and repeat. :) What other way can this sunday in your life have a bigger impact on the world? :)