I think of it like this: burnout "cracks" begin to form. If nothing is done about them, the burnout prevails. You can normally tell if someone is burned out if they're continually tired, stressed, anxious, or in a constant pattern of working too late. Burnout is what happens when people aren't bringing their best selves to work anymore, and when they don't have the energy to produce their best.
The hard thing is that burnout is a two-way street. While it's up to the individual to set boundaries and protect them, it's also up to the manager and culture to support that. if that balance isn't there from both sides, it becomes a very tricky situation.
The hard thing is that burnout is a two-way street. While it's up to the individual to set boundaries and protect them, it's also up to the manager and culture to support that. if that balance isn't there from both sides, it becomes a very tricky situation.