With the "will there be overtime?" betting line, you are simply betting on whether or not a game will go to overtime.
This line is used in any sport where overtime is used, such as basketball and hockey.
Let's look at a real "will there be overtime?" line that was available for a NBA game between the Philadelphia 76ers and Brooklyn Nets. The "Will There Be Overtime?" line looked like this:
Will There Be Overtime?
Yes, +1600
No, -6000
So, if you bet on the game to go to overtime and you are correct, you will be looking at a massive payout. For every $1 that you wager, you will receive $1,600 in total profit.
On the other hand, the "no" side is a massive, massive favorite.
In fact, you would need to bet $6,000 in order to have a chance of winning just $100 in profit.
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The "vig", or the amount that the sportsbooks make, on these wagers is monstrous, and they are not good bets.
After all, the book is paying out $1,600 in profit if the game does go to overtime, but requires a bet of $6,000 to make a miserly profit of just $100.
This is obviously not a winning bet over time, so you should keep that in mind if you think that these wagers are "free money".