500GB enough for 50GB games, saves and DLC?

So i read that the XB1 has 500GB of storage,and the games ( based on PS3 games) will be 40-50GB, if that is the case, will i only be able to play 10 games at a time without buying another hard drive to connect as they all have a mandatory install? plus the added data like saves and DLC

EDIT: ok, you are all saying that most games are 20GB, I just heard somewhere that FF13 took up 5 discs on XBOX360, and only one on PS3, because it was like 45GB but at was probably just that one game, sorry.