I am constantly fighting to maintain this boundary. I'm fortunate to have a lot of freedom and flexibility, and the culture of long workdays isn't quite as militant as what you're facing. It can get competitive at times -- as in, "I was working until midnight last night", "yeah, I feel you...I was still answer email at 2 AM" -- but we encourage each other to take days off, leave early when we get the chance, work from home, etc. Still, there are definitely times when it feels like the number of hours are judged as proof of your dedication to the organization, as if you have to justify that you're always giving everything you've got to the place.
I've been vocal and stringent about keeping my boundaries where I want them. I may choose to work more, but I make it clear that it's something I will do on my terms and will retract at will. You're in a tougher situation due to the pressures from without as well as within the organization, so I recognize that it's a lot harder to set that boundary and keep it there. If you possibly can, though (in whatever way would make the most sense or have the best likelihood of success), I can attest that it makes a significant difference.
"I can't help it: offering up precious personal waking hours on the altar of the enterprise business system feels toxic to me"
Because it is. They're effectively stealing from you, and stealing your most precious resource, at that. Your time and mental energy are your most valuable assets. Your employment is not a favor, it's a business arrangement. They wouldn't feel entitled to 25% extra from any other vendor; there's no reason they should feel entitled to expect it from you (or their other workers). Again, I recognize that I'm simplifying here (BELIEVE me, I totally understand the dynamics), but there's a reason you're feeling what you're feeling. Trust your instincts.
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I've been vocal and stringent about keeping my boundaries where I want them. I may choose to work more, but I make it clear that it's something I will do on my terms and will retract at will. You're in a tougher situation due to the pressures from without as well as within the organization, so I recognize that it's a lot harder to set that boundary and keep it there. If you possibly can, though (in whatever way would make the most sense or have the best likelihood of success), I can attest that it makes a significant difference.
"I can't help it: offering up precious personal waking hours on the altar of the enterprise business system feels toxic to me"
Because it is. They're effectively stealing from you, and stealing your most precious resource, at that. Your time and mental energy are your most valuable assets. Your employment is not a favor, it's a business arrangement. They wouldn't feel entitled to 25% extra from any other vendor; there's no reason they should feel entitled to expect it from you (or their other workers). Again, I recognize that I'm simplifying here (BELIEVE me, I totally understand the dynamics), but there's a reason you're feeling what you're feeling. Trust your instincts.