I'd think that having to leave 15 minutes early means you can't properly manage your time. You're giving yourself a buffer specifically so you don't have to manage your time.Once in a while, it happens but if that is your SOP? You do NOT know how to manage your time properly.
If an ETL knows that you're close to compliance, but stops you anyway, I would say they share more of the burden. They're at a higher paygrade, they're leadership, they should know better. Unless you're literally on fire, it can wait until after lunch.