Firstly, you are entitled to use the whole run-up area (marked from the throw line to the track). Plus the whole width of the track (usually 8 lanes) to the surrounding fence/barrier around the track. This measures in total.
This doesn't mean that you have to use the whole distance for your runnup. The main concern here is getting the right distance for you to maximise your controlled speed while still being able to stop before the throw line. This will vary from person to person because factors like stride length and leg strength play a big part.
TOO LONG V's TOO SHORT
If your run up is too long your muscles will get tired before you reach the throw line and you will lose momentum when you need it most.
If your runup is too short you will not reach your optimum speed and that lost speed clearly won't transfer into your throw.
Generally a run up should be long enough to fit a minimum of 7 strides at full speed.
For more info on how to set your run up markers and measure your optimum run up length go to: HowtoThrowtheJavelin.com
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