I had a JUCO coach ask me the same question and I sent him copies of the legal guarding section of the NCAA rulebook. You know the part about what it takes to establish and maintain legal guarding position (4-32-1&2) and closely guarded violation (9-13-1b1). I believe that the NCAA has been very clear about this and I believe the NF has the same rule.
In a nutshell, break the 6 ft barrier or get past your man (so the defender is not in the path) and the count stops.
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