How much stress can lead to burnout?

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Burnout is the exhaustion of physical and emotional strength or motivation usually as a result of prolonged stress or frustration. But how much stress can a person tolerate before it can result to burnout?According to Wiki, burnout is construed as a result of spending too much effort at work and having very less recovery but some argues that it is a particular personality trait of workers. Other European countries that have included work stress and burnout in occupational health and safety standards and hold organizations responsible for preventing and treating burnout. Reference: http://en.wikipedia.org/wiki/burnout_%28psychology%29