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.
Standard flight school equipment is a map of the wide area (think 1/2 of Europe) of the school with a sturdy pin or nail exactly through the home airfield. Attached to said pin is a piece of wire. On the map itself (in a convenient location - usually over the sea) a scale is added in nm and flight time, whose origin is the same home base. Works wonders for visitors: "Can you really fly to London in just two hours?"