To help with the planning phase, we’ve added a new enhancement to Tzunami Deployer which measures and displays the volume of data which was migrated after the Commit phase, once all content, metadata, and security was deployed to SharePoint. Find out more about our advanced SharePoint migration reporting here
SharePoint Migration Timeline: How Long Should It Actually Take?
TL;DR: There is no single answer to how long a SharePoint migration takes, and anyone who gives you one without asking about your environment first
