Canned evaporated milk is expensive, and every recipe for homemade that I found used powdered milk (yuck!). I searched the web and found this one. This makes the equivalent of one 14 ounce can. The time is estimated as I didn't pay attention to that while making it - I just let it simmer while I worked on other things. This isn't a quick substitute for when you don't have canned milk around; it takes a long time to simmer to the right level. But it's cheaper than canned, fresher and you have control over the process, unlike store-bought.