It varies. Normally I'm about 5 inches behind the front dots (closer set). I'm pretty large (6' 3", 290) so this may seem a bit close. However, if I need to vary speed I'll move up or back, shorten (or lengthen) my steps and work from there. I'f I started at the back of the approach I'd always throw the ball thru my break point (way too much speed would be generated).
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Will Jesus bring the pork chops?
"I do desire that we may be better strangers."
(Willie the Shake, As You Like It(III,ii)