Overstaying is generally considered a violation of immigration laws and can result in penalties, fines, deportation, or difficulties obtaining future visas, Maybe around $5000

The CBP officer has the authority to decide how long he thinks you should be staying, nevermind your 10-year visa that required multiple documents and interviews, you are still going to submit to what the CBP agent decides for you So he can decide to give you a 90-day length stay and no more

There are different punishments or fines depending on how long you overstay