Thinking about canning stews, I guess you'd have to process for the longest ingredient. I canned potatoes and they were 35 minutes, and the meat is 75 minutes. I looked up carrots and they are only 25 minutes. Most other veggies are 25 to 30 minutes. To be safe, I'd think you'd have to process for 75 minutes. Likely to have some very done carrots and potatoes (but for me that would be okay, because I like them kind of on the mushy side).
