How long can a helicopter hover in place? (And what is the record?)

We've seen helicopters hover both in movies and in real life rescues, even briefly. When put to the test, how long can ...
CNN

AI probe of aviation close calls leads FAA to limit how helicopters can fly around busy airports

Air traffic controllers will now use radar to actively track helicopters when flying through the flight paths of planes taking off and landing at busy airports, the Federal Aviation Administration ...