Rendering fat by sous vide

I've seen that fat will render at 55-60 degrees centigrade using sous vide - but my question is how long that would be expected to take?
Best Answer
Thomas Keller's cookbook "Under Pressure: Cooking Sous Vide" recommends 1:30 @ 85C for beef or duck fat, 1:00 @ 85C for marrow fat, and 0:45 @ 85C for foie gras fat.
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What temp does fat render in sous vide?
Sous vide can deliver fantastic ribs. Fats should render at temps between 130-140, so you were not eating the raw fat - just too much of it.How do you render fat after sous vide?
Sousvide can render fat if warm enough (135), but in shorter cooks for steak it will not compare with dry hotter heat. For that reason I prefer to reverse sear ribeye and steaks with lots of fat. Longer cooks can render fat at cooler temps (131 or so).What temperature does fat render at?
130-140\xb0F (54-60\xb0C). Fats begin to liquefy, a process called rendering. This is a slow process and can take hours if meat is held at this temp.Do you render fat at high or low heat?
Put a small amount of water at the bottom of the pot you are using to render the fat (around 1/4th of an inch). Just enough to cover the bottom. This prevents the fat from browning as we begin to heat it up. Turn the pot on a medium low heat and let the fat gently warm up and begin to liquify.Rendering Lard Using the Sous Vide Method - How to Get Truly Neutral-Flavored Leaf Lard and Back Fat
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