I would say it depends on how you diet and how active you are. A few years ago I lost 45 pounds in 10 weeks. I'm 5'7" & at the start I weighed 193 lbs & got under 150 lbs at the end. I stayed on a relatively strict diet keeping carb grams at or under 65 per day, ate a lot of proteins & balanced everything out over 6 meals per day. At any one meal, my protein intake did not exceed 3 oz. A key to my success is that I also am a very active swimmer and worked out vigorously in the pool for an hour, about 5 to 6 days per week.
I also occasionally did a treadmill workout trying to keep my heart rate at about 65% of maximum for a prolonged period of time. On this I eventually worked up to 1 hour sessions. Even walking is a good way to burn calories. I was often hungry & if I wanted to cheat, I ate some kind of small portion of protein. If you are inclined to cheat, stay away from breads, cheese etc as these are very good at defeating any diet, but my cheating was minimal and, as I got into the diet, my periods of being hungry lessened.
That all said, my guess on losing 110 lbs might be a good 6 months or more if you stay focused on the diet, don't cheat, & get some kind of regular exercise for an hour, 5 or 6 days per week. The upside is, if you do it, how much fun it is to fit into smaller cloths. When my weight is down, I also look younger - an added benefit for someone in their 50's. Also - I am diabetic, have high blood pressure, & high cholesterol - I take daily medication for each of these. With the weight off, my medication doses are reduced or even eliminated - all a good thing.
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