From receipt of Architect’s 2D drawings (ideally as DWGs) to Architectural and Structural BIM is typically 4-6 weeks. Then we add in the MEP content over several more weeks. This is when we discover the issues and start holding weekly meetings to resolve them. It is possible to model and coordinate entire projects before you actually break ground. However, it’s more realistic that your lower level modeling has been completed at that stage with the final upper floor finish modeling overlapping the start of construction.