How long if someone is put into p.c do they wait to make a phone call?

PC or protective custody or administrative segregation is also known as the SHU, special housing unit, the hole, solitary confinement. Therefore the rules are the same for all inmates in the SHU. There is only one phone call per week, limited commissary, limited rec and limited showers. So, to answer your question - "yes they will have to wait unit it is their day to call." Mine was on Friday.