[MENTION=132916]Junaids[/MENTION] ... No response to this ?
You probably missed my post in a different thread ... here is the clip that gives a fair indication of how far back the slips were when Thommo was bowling full speed (pre-injury) .
https://youtu.be/kF14-_npFVw?t=21s
It is very clear from that footage that the 1st slip is standing at about 10-12 steps from the stumps. Reduce the playback speed on Youtube to 0.25 and you can easily count the steps as the 1st Slip fielder jogs towards Thommo.
Footage is from the 2nd inngs of the 1974 Gabba Test match : http://www.espncricinfo.com/ci/engine/match/63136.html
Sorry but there is no evidence to back this up.