How much bandwith on average would one running instance of UE4 consume?

I’m looking to get UE4 installed on a school network for a game design club. Before installation may occur I have been asked to guesstimate average consumption of bandwidth. The school has very minimal bandwidth and is already testing the limits of that so I am wondering how much a class of 20 students would consume?
Then I can work out if it will cripple the whole network (or not hopefully!).