I have three cell phones. My wife and I use anywhere from .5 to 1.5 GB of data a month each. My 17 yo daughter on the other hand, 14-18 GB a month, mostly cause she is on it 24/7 and streams music when she is out.. I was on the 18GB plan and bumped it to the 20GB plan for another 20/month cause she kept going over. Screamed about it till I was blue in the face. nothing. Got the family manager and locked her down to 14 GB a month. when the lock went in she wasn't able to text to all her Group Messages and blew a gasket!..
So yes, it is very easy to use 24GB of data.. Imagine adding two more teens to my situation...LOL