As an estimate, about 5 and a half months! The average loss is a stone a month, sometimes more!!
And regardless what diet you do, if you go back to eating how you did before, you will always put it back on!!
The classes really help tackle that tho, with cbt and discussions in group! It helps figure out how and why we are this way, and how we can train ourselves to not see food as such an important priority, but simply fuel to get out body working to its best! X