Here is a step by step overview of the project broker down into six phases with the estimate days for each section. Of course, that never happens and of course this would be with two people working full time. I am one person working part time so 60 days is not gonna happen but the time doesn't matter. It is about the process and planning for what materials and supplies you will need as you move your way through the project. Feel free to take this image and use if for your project. I accidentally deleted the original doc but at least I had a screenshot of the content!
I used this spreadsheet to organize the wall and roof areas and window openings. This will help when ordering materials for various projects. How much insulation will I need? How much sub-floor, etc etc. This info will go a long way towards making the right decisions when planning the project.