Folks might find this useful - I certainly do. On the wall I have one of those all-Europe charts which shows airfields. Also, I have a home-made ruler-like piece of wood which is marked in still-air hours (at the map scale) for my aircraft. So, at the pre-planning stage it's very quick to use this 'ruler' and to obtain ball-park flight time figures. It helps greatly when guess-timating leg times etc.