Once you get to senior you can coast forever and no one will bother you as long as you're meeting expectations, which gets easier and easier once you know the company culture. Anyone with 5+ years of industry experience or 2+ years at Google can figure out how to coast on 30 hours a week if they want. There's 100,000 employees, no one notices. Ads is a seemingly endless firehose of revenue so the bottom line is never threatened by your laziness.
