If you self driving please give yourself 3 hours to drive from Edinburgh to Aberdeen. Traveling in Scotland, even though the distances look small if you are coming from the US etc, takes a long time getting from one place to another, even if the weather is nice. So please give yourself ample travel time.
If you are taking a coach or train, confirm if it is a direct, local stop or 'change' over with your operator as your times can vary a lot in getting to your destination. Some will stop in most small villages and that adds on a lot of travel time.
This tip is provided by supplier M15501