What would you do if you found out after you accepted a job that the amount of overtime is a lot more than what you discussed in the interview?

Okay so I accepted a job that looks good on paper. Yes we discussed overtime in the interview but now I am finding out that in reality it is a lot more that we discussed. I honestly feel deep down inside that I will quit if it keeps up like this. Any advice ? Would you a) just stick it out until the contract ends and then say you don’t want to renew the contract or would you confront it upfront and have a discussion with them.