Just out of curiosity, how much does it cost, in money or time, to get all the heroes in League of Legends? It may be a good game, but it's also outrageously ex

Just out of curiosity, how much does it cost, in money or time, to get all the heroes in League of Legends? It may be a good game, but it's also outrageously expensive. Unless you like playing a limited set of heroes.