If I recall its not the same time as turkey per pound. I want to say more like 7-9 minutes a pound while turkey is 3-4 minutes. Average time for a 5lbs bird is 45 mins.
... when i used to fry turkeys commercially back in the day, somebody asked me to do a chicken (a capon, actually) ... i wasn't sure about the cooking time, and i couldn't get any solid advice from anyone around (AND this was back in the olden days before the interwebs) ... so i called the 1-800 number on the cajun injector jar, LOL
This was back before they sold the company, so i actually wound up with someone on the phone from the restaurant. They explained to me that the cooking time per pound was actually longer because a chicken doesn't have as big of a cavity, so it doesn't cook from the inside and outside like a turkey does.