The Metropolitan Opera lists the length of all of their shows including intermission(s) on their website! It all depends which show you're seeing.
The length of the show is typically on their website. If for any reason it does not appear, their box office is always helpful.
If you can't find the info on the website, call the box office
4 am
Finish at 2
It will end 11:03pm.
If it's good, the performance will live on forever in your memory. If not, somewhere between 2-4 hours.
This performance lasts 3 hrs 28 mins.
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