30 minutes before boarding they no longer allow you to print a boarding pass (so you’d better be checked in and have it on your phone). I learned this the hard way when I arrived 20 minutes before a flight. However, it’s no big deal really, I caught the next flight an hour or so later since they are obligated to book you the next available flight.

I try to be there about 30 minutes before the flight now, but with boarding pass ready on my phone. The only reason I give 30 minutes is in case of traffic or if I want to grab a quick bite. If I could guarantee my arrival time at the airport it would be even less.