They should laugh and tell you no. Interrogate why they need 2 additional months to build it the right way. Why didn't they build it the right way to begin with, adjusting approach at every step?
In my experience, engineers (I am one too) tend to reach for quick and easy more than correct and hard, and that choice is coming from them, not the business.
In my experience, engineers (I am one too) tend to reach for quick and easy more than correct and hard, and that choice is coming from them, not the business.