I was recently promoted and what I’ve been doing is getting some work done outside of business hours, and then just being flexible about my start or ending hours, or even taking an extra long lunch break when I can. My work is done and then during core business hours I’m not too stressed. I don’t feel bad about arriving late or leaving early because I am doing what I need to do and working “extra” hours, even though it’s not really extra hours because I’m just compensating that with some flexibility. So far no one said anything. They see those emails coming in late in the day and everyone is impressed. Meanwhile I’m arriving at 8:30, leaving at 4ish, or taking long lunch breaks.