My school has a weekly PLT/PLC (same thing, different term) for 90 min and a weekly staff meeting (60-75 min.) It's not so bad. They're pretty structured, so it doesn't usually feel like wasted time. Once a month we meet with our School Improvement Committee as well. My last school had only 45 min PLC meetings and that actually felt like wasted time because we could never "dig deep" in such a short amount of time.