I benefited from Tim Keller's
Every Good Endeavor.
To your question, it sounds like something to discuss with a pastor or elder at your church, since the specifics of the situation are probably more complicated than we can really help with. But I'd like to give a few principles to think about. You mentioned these specific issues:
- high pressure
- burnout
- bad company
- unfair treatment
- task-oriented instead of people-oriented
- overworked
Certainly none of these are
good things, but I'd echo JWithnell's reminder that we can't expect perfection in this life. But I think there are factors that can help determine whether you actually need to leave such a job.
Bad company corrupts good character, unfair treatment breeds resentment, and overwork and high pressure can (as you said) overcrowd your prayers and spiritual thoughts and works of charity. So if you feel your character is being corrupted, it's probably best to leave. There are ways to mitigate that, and to be prayerful in the midst of busyness, and so on (again, talk to an elder), but if you're sensing yourself becoming corrupted, that seems like a red flag.
If they're having you work on the Sabbath without giving you the option to say no, that too seems like a red flag, or worse.
I think task- versus people-oriented is more a matter of preference than of good or bad, as long as the work can actually be seen as benefiting people or properly stewarding the earth. If not, then it's another red flag.
Quitting a job without having a backup can be problematic, obviously, both in terms of stewarding finances and in terms of working for the glory of God six days a week. I don't think I have enough life experience to give you good directives on when to do such a thing, other than to be very careful. And looking for a backup while being busy in a draining job can be exhausting too, I know.
My dad often likes to say that "the forty-hour workweek is a twentieth century invention." I think there's truth to that -- modern westerners, including myself, prize leisure much too highly -- but the twentieth century invention was a good thing in some respects. Workers should be able to have ample time with their families, adequate sleep, etc.
All of my above thoughts should be seen as thinkable, but not actionable. For actionable, I'd recommend 1) speaking with an elder or elders, 2) reading and rereading the Bible verses on work, and 3) reading one or more of the resources that were recommended in this thread.