3 years with interior finishing and exterior landscaping is not unrealistic, the mole is right about that.
In our new development area, many houses with gardens, paving, terraces, etc. are already completely finished, construction started in October 2021. You can only manage that if you let everything be done or don’t have a job or put it on hold for a year.
Then it just gets expensive.
On the other hand, you have to endure 3 years of your own work first. You must not forget that the wife used to stay at home.
And you must not forget the rent during those 3 years...
Because with 2 small children, I can’t live on a construction site in a makeshift setup for 1 or 2 years.
Also, the willingness of friends and neighbors to help was very different before. Yesterday I dug out my construction water box. The neighbors came by, greeted me kindly, and mischievously asked, "Tough work, huh?"
I am sure 50 years ago the neighbor would have grabbed a shovel and helped. It just isn’t like that anymore.