comfort zone

/K AH1 M F ER0 T Z OW0 N/
noun
  1. 1

    The range of temperature, humidity, and other environmental factors that people or other organisms require in order to be physiologically unstressed.

  2. 2

    (by extension) The range of circumstances in which a person feels relaxed or able to cope.

    The demanding interview panel took him well out of his comfort zone.

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Source: https://en.wiktionary.org/wiki/comfort%20zone