Most German corporations are now banning out-of-hours work, with government regulations stepping in to tighten these measures in order to improve work-life balance in the country... I don't know if other countries like USA and UK will ever follow suit, but until then it seems that most employers in the English-speaking world equate "going the extra mile" with also working out of hours.
I am in a situation where - for a number of reasons I don't want to elaborate - it is getting unsustainable and energy-draining for me to work too long, and while I was one of the best employees of my company (junior manager level, promoted twice within the company), I think the only way for me to regain my balance is to work 9-5 and completely switch off from any work after that.
The question is: how can I do so without appearing as less passionate and motivated than I used to be? As an individual contributor I sometimes worked 9 to 10 pm for entire months. That may have also contributed to my promotions.
My employer generally has no rules set in stone about working hours as long as we deliver and are productive, but I fear there might be unwritten political rules in the Anglophone corporate mentality that determine progression and promotion.
My direct supervisors/line manager would not mind because he is rarely in the office anyway, but my concern is more about perception by other coworkers, my own reports and other superiors I work together with as a team but whom I don't report to (For example, there is one influential colleague who apparently has been asking why I am leaving "so early" recently. He is not my manager, but he has good connections...).
I am genuinely motivated in my work but I simply have more things in my other areas of life. I also think that my perception of exhaustion is making me less productive at work.