I have used APO as the Prinicipal Gallipoli Tour Guide for many years when organing private groups to visit Turkey. The length of the time spent on the Gallipoli Peninsula depended upon the interest of the group. For example, some groups stayed for 12 days studying the campaign  in depth. Others were as short as 3 days. 

I met APO over 20 years ago and over that time he has worked with many excellent Turkish Tour Guides learning from them and continually increasing his knowledge through study.

This is the Guide you want if you are time short and can only spend a day at Gallipoli especially if you want to make it meaningful. (eg visit a family grave or find a little known battlefield sector where your ancestors fought)