How long till the serious pain of your industrial piercing goes away so that you are able to sleep on your ear again?

When I got mine done the pierce said that it would hurt on its own for about a month then after that it will only hurt when you hit it or get it caught on something. When I went to get a consultation they said it was better if you get it on the ear you don't sleep on because sleeping on it can irritate it, but if you do want to sleep on it wait about a month and make sure to change your pillow case 3 times a week.