you might want to remove "properly" from the title, as you just mean refrigerated.
if things were done "properly" from start to finish you would get 3 months for beef and 1 month for others usually
but things are not done properly here
best thing you can do is put meat straight in the freezer, put in fridge to thaw 24 hours before you want to eat it
can also turn fridge right down
as for how long i keep it, it all depends
if from supermarket, then 3 days max here
if i get the animal soon after slaughter then would be much longer in the fridge (if not frozen)
if storing it properly by removing one of the following: air, moisture, energy, heat, time. they it would be as above
without one of the 5 the bacteria cannot grow
so vac packing meat when you buy it will stop it going off so quick, and/or you could coat in oil or tallow
i don't usually buy from supermarket but when there i have noticed quite a few new brands that vac pack their beef
be worth eyeing the use by dates they state
and remember it is very common to dry age beef for 3 months, which is commonly just refrigerated with a fan