I don't think knowing when you're being asked to work too much is a thing that comes automatically with whatever job skills you're hired for. Even if you work in management or HR, where having a sense of "too much work" is part of your job, you might not be objective enough to apply that expertise to yourself.
And even if you know you're working too long, you might not feel empowered to do something about it. This could be because you literally don't have the power—your employer requires everyone to work unreasonable hours—or because you lack the confidence or skills to use it.
And even if you know you're working too long, you might not feel empowered to do something about it. This could be because you literally don't have the power—your employer requires everyone to work unreasonable hours—or because you lack the confidence or skills to use it.