Mini Beer Kegerator

Kegerator (beer collector attached to a small refrigerator that houses a half roll) question …?
Just purchased a kegerator (collector beer that is attached to a mini-fridge that holds a half-barrel) and I have a question about it … How long a barrel last time it intervened? How long until it goes bad? Is life different from one barrel to a quarter barrel? help appreciated
Keep it nice and chilled and should last a couple of weeks or so, unless I drink it. Life does not change because you're not getting older, would be different if he is fine.
Homebrew Kegorator