whowhenwhy - as I mentioned earlier, every helicopter pilot knows the dangers of another helicopter's rotor wash but despite being of similar strength, especially things like S-92 and Merlin, to a large FW, the vortices do not persist and dissipate in a very short distance from the aircraft.
Even if you do encounter the wake of another helicopter, there is no loss of control or stall, it usually just affects your power required briefly.
There seems to be a dearth of evidence or any research to produce such evidence that would lead you to apply a FW safety protocol to a RW aircraft.
As I mentioned, a 3 min hold is complete overkill for a helicopter to transition after a heavy or super FW has rolled or gone around.