In fact, I don't know exactly what a full node is.
A full node starts by downloading ~500 GB. After that, it's ~2 GB per week.
And in case OP wants to use 'txindex' (I assume he would prefer to have it, as he plans "to query the balance of a specific address"*), then there are extra 50G.
* - it will be much easier installing additional software for that, like
https://github.com/janoside/btc-rpc-explorer