So, I played with it today. I set it up in a cooler-- 22 measured Qts with a lid (custom cut for the Anova). I started with water @ 68F and set it to 140F. It took an hour and ten minutes (70 min = 72 degrees). So basically, at full capacity you can figure 1 minute per degree. Once there, it held it perfectly well. I would advise, though, getting your water closer to target through other means first (Boiling water + ice cubes, for example) and then letting the Anova maintain that temperature.