Bidding projects of that size will require a lot of home work. Can you get from point A to B relatively easy or not. I have wired LARGE homes in the same sime it takes to wire a mid-sized home, all depending on what is going in and can you get there easily.
As QQQ has mentioned, look at your past installs and see how long they took for each phase and go from there. When you start looking at all the details of the install, you will be suprised at how much "little" stuff there is that is often overlooked.

Good luck !