4h at full speed. Uncapped is effectively an 8TB cap, so they delivered 0.6% of what they were supposed to.
My grandma has a plan like this and visiting her for less than a week detonates her (hidden) cap just from my phone backing up its apps.
My home internet sits at multiple TB a month despite backups etc. not even running through it since it syncs to my local nas on the same network.

On 50GB you coulnd't even install a large game.