Most places I've worked, people would just wonder why you were so inefficient that you needed the extra time to do your job. Like, yeah everyone else does this shit in 40 hours, but this guy keeps showing up on Saturday, so he's either fucking around during the week or he's bad at his job. Anywhere that would think it was a good thing wasn't the kind of place you wanted to move up, it was the kind you tried to leave as soon as you could. Because they were run by the kind of morons who think the appearance of working harder was more valuable than actually doing something useful.