Sous Vide time for 1.5 lb 1 inch thick bone-in chuck roast at 140F
It takes very roughly 81 minutes for your meat to reach the 140F cooking temperature assuming you have just the meat and no marinade in the bag, and no part of the meat is frozen. The rest is all steady state cooking time. Based on my own experience, I am inclined to say that if there is any difference in texture and flavour between 12 hours and 24 hours, it is subtle to the extent that it may be noticeable in a side-by-side comparison.