For the first 3 years, between 30-40% in pvt was my average. When I was at webcams, it was more like 80%. Now at Streamate, I usually spend about 10 mins in freechat for every 6 hour shift I do, and when I am in group chat I have 1-15 guys in there at once, usually 2-3. But I have 5 years of devoted regulars that keep me in pvt all night that's why
Why do you ask? It's def gna vary website to website, but when I Worked for a site that kept track of that kinda stuff in the stats pages I told my new girls they should shoot for 30%+ in pvt.