Glorious Healthy Beef Tallow!
How to Render Tallow
First you must obtain the suet. Contact a local butcher and ask if they have any on hand, most will not, but will usually save it back from future slaughters and call when they have it. Once you have it, keep it frozen until ready to render it. When you are ready, just chop it into small pieces, and toss into a crock pot...set on high for a couple hours, then reduce to low for 4 more hours or so.
UPDATE: I recently rendered the tallow from 4 cows, and netted close to 9 qts. So I would estimate a couple qts per cow.
Also, instead of freezing the tallow, I canned it...just pouring hot tallow oil into hot jars with heated lids and letting them self seal.