I went on two trips totaling 5 days in July. I used 45GB of data. We do have 3 kids and they were streaming netflix and movies from my home pc network, as well as using a roku, 3 tablets and a laptop, and listening to pandora.
At one point we were watching our data usage on the hotspot and it was climbing like a meter on a gas pump. That is the most data I've ever used in such a short time though. The kids had two of their friends so maybe that helped. We have 3 mobile hotspots though all with unlimited data. Usually I use 10-15 gb of data for 2-3 days.