Earth’s quietest room measured -24.9 dBA, low enough for visitors to hear their own bodies, but the claim that nobody can last an hour is false and misunderstands what an anechoic chamber does

The current Guinness World Records holder is an anechoic chamber at Orfield Laboratories in Minneapolis. In 2016, London South Bank University reported that a visitor spent one hour and seven minutes in its anechoic chamber. It does show that an anechoic chamber does not carry a universal one-hour human limit. These rooms are measurement toolsThe most important thing about an anechoic chamber is not how long a visitor can tolerate it. The US National Institute of Standards and Technology uses its acoustic anechoic chamber to test microphones, loudspeakers and hearing aids.