It's a lot and I'm not surprised. Recent research in my country (from a reputable institute, the Netherlands) mentions 1 out of 6 people feel burnout and ranks IT industry in the top 3 sectors. This survey articulates it in quite a broad way however, just asking if respondents have 'feelings of burnout', which most of us have once in a while.

That doesn't mean they are burned out clinically speaking, or even if they have symptoms of burnout. It does point to a large, systematic problem in the industry (and society in general).