How much data does LoL use?

Hello,

I just recently got Verizon Jetpack mobile hotspot unlimited data but I could only use 15gb/month. After i use 15gb it will slow down. I am wondering how much data does 1 game usually use up? How many games can I play? I read some forums it said as long as I am not streaming any videos/tv shows/movies I could play as long as I want. People are saying that playing LoL doesnt use that much data. Is 15gb enough data?