When adding an epic or story, I can define the estimate as a certain amount of days one is going to spend on the story or epic. However I can't define the "lead time" which also has an impact on planning. For instance getting a contract signed is only 2 days work, but it might take multiple weeks before it is finalised. I can use the "Earliest Start" field to set it correct in the planning, however when planning is shifting, the earliest start date doesn't shift along. Therefore it would be great that a "lead time" feature would be added to portfolio.