I'll back up what strulovich said. Every team is different, but most folks on my team are in the office from 9:30-6 or so. Some come in earlier, some come in l

I'll back up what strulovich said. Every team is different, but most folks on my team are in the office from 9:30-6 or so. Some come in earlier, some come in later. I'm a parent and on a train commuting schedule, so my day is 7:45-5:15 or so. You can get PIPed out at FB, but in my org it's very, very, rare. Out of 100 people, only a few people received a rating that was less than "Meets All Expectations" and none were in danger of a PIP. Regardless, people are measured by the work they do and against expectations of their level. There is no "hours your butt is in a chair" requirement. The big caveat is that some teams are more hectic than others and quality of managers may vary.