.....generally does it take to cycle to a point on the horizon? This is a genuine enquiry. I can just see the Dartford suspension bridge struts on a clear day from my office and was wondering how far it was and how long it would take me. Obviously I can look at a map but I wondered if there is any rule of thumb. I keep meaning to tackle this as a ride home but I've chickened out so far. If I can make it to the bridge I can almost certainly drag myself home from there.