Unless there's something I'm missing, it would last on the battlefield until the next time an end step begins (wich would probably be at the end of your opponent's next turn.)
You can put the "at end of turn" trigger from unearth onto the stack, then use sundial or time stop to end the turn. Then they won't trigger again on any other end steps.
At the beginning of the end step, a creature returned to the battlefield with unearth is exiled. This is a delayed triggered ability, and it can be countered by effects such as Stifle or Voidslime that counter triggered abilities. If the ability is countered, the creature will stay on the battlefield and the delayed trigger won't trigger again. However, the replacement effect will still exile the creature when it eventually leaves the battlefield.
This is from the gatherer rulings. Yep. End step.
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This is from the gatherer rulings. Yep. End step.