40 pounds in 10 weeks is very fast according to your current weight of 226 and you're 5'6". I guess the point being that the first 50 pounds came off quickly because you had a lot to lose.
However as you approach your goal weight, weight loss tends to slow down. Sometimes the scale won't budge and you're doing everything right. The weight plateau syndrome that everyone goes through. For instance I've been trying to lose the last 6 pounds for months now, and at times I feel like taking a sludge hammer to it. I think my weight loss has slowed down to 1 oz. a week, haha.
I guess the point is, if you don't lose 40 pounds in 10 weeks, are you going to get discouraged, or are you going to stay with it for as long as it takes? We also know that weight lost slower, meaning 1 to 2 pounds a week tends to stay off, versus rapid weight loss.
And any weight lost up until June 12th is a success.
Good luck to you on your goal, I am excited to see how you do.