This horrendous recipe was the first result on google.

Suggests 12-14 hours (at 135 for med rare) for a 2 lb roast. Rest of the internet makes it seem like it should be more like 3-5 depending on preference and probably fat content. Just a good reminder to not blindly follow any online recipe

https://www.themeateater.com/cook/recipes/sous-vide-venison-roast-recipe