An expectation of 10 hour days? Ridiculous. You might be the only one walking out at 5:15 the first few days, but you might get followers, and improve the culture at your workplace in the process. If you're meeting your tasks and deliverables, your hours as a butt in a seat shouldn't matter.
Alternatively, start working from home 2 days a week. Approach your boss with the idea you're more productive without the commute time sucking up 1/4 of your workday
>If you're meeting your tasks and deliverables, your hours as a butt in a seat shouldn't matter.
Alas, there are many companies where that's directly against the culture of 'shared torture'. If you're not killing yourself like everyone else, "you don't believe in the dream and you're only a clock puncher".
Just have a spine and leave at the normal time. What happens, happens. Its insidiously nerdy and meek to be in an office full of people who are all afraid of the "usual time to leave"
Alternatively, start working from home 2 days a week. Approach your boss with the idea you're more productive without the commute time sucking up 1/4 of your workday