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Endurance runners will typically do one long run a week; shorter distance runners may do one long run a fortnight. The long run should be between one quarter and one third (certainly less than half) of your weekly mileage. So if you are running 10 miles a week, your long run should be around 3-4 miles. The table below sets out recommended distances for long runs.
There is a range in between walking speed 4-5kmh/h and 100m record sprinting 37.58km/h (Usain Bolt 2009). Generally for longer distances average speeds are half those of professionals, so for a marathon 2 hours becomes 4 hours or 10.5km/h. Average speed as you can see really depends on the distance, once you've decided this then Yih can use my rule of thumb of twice pros for a feel. Good luck!