You can if you have signed up a account online, you gave to do it on Enterprises website, but it's best to call the location directly as they may have the rental promised to aborher customer based in the original date you were scheduled to return it. I hope this helps answer your question.
You can extend your time, but this is not the site to do it. I recommend calling or emailing the office you rented from.
You can call the Enterprise customer care and do it now
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