I'm not an expert but I don't think you should be rolling more than once per week. Like mentioned above, wounding is only one half of the process and you have to give your skin time to heal.
I just started recently and after waiting only one week between my first two rolls, I waited two weeks before my third roll which was earlier today. I plan on waiting two weeks between my next few rolls as well; once I need to replace my current roller, I plan to buy a 2.0mm (using 1.5 right now) at which point I might up the time to three weeks.
Just remember derma rolling is relatively new and all the kinks have not been worked out yet, so no one knows what the ideal wait time between rolls is.