Just landed on UA 840 SYD-LAX and the seat belt sign was ridiculously used. Took about 55 minutes for it to turn off after and came on at least 5 times (when I was awake) any time it hit mild turbulence.
Agree with the others. Heck, some foreign carriers (like SQ) turn it off even while still in the incline and not even at cruising altitude. I don't get UA's attitude on this one.