The amount of beers that you can fit inside a mini fridge is around 22 beers that are 12 ounce beer cans.
That would be 22 12 ounce beer cans in a mini fridge that is 2.6 Cu. Ft in size.
A larger mini fridge could likely hold 25 or 30 of those 12 ounce beers.
It also depends on the size of the cans of beers so the large size of beer cans or bottles the less you'll be able to fit in the mini fridge.
If you're gonna put beer bottles in the mini fridge then you might get 15 to 22 of them in the 2.6 Cu. Ft mini fridge.
It's hard to say exactly without knowing the size of beer you have and the size of mini fridge you have.