Time length between dermapen (microneedling) treatments? 2mm setting used.

Recently started having dermapen treatments done. my doctor used an aggressive setting of 2mm. i am happy with results but am reading conflicitng information online. my dr suggests waiting 4 weeks before getting anothet treatment, but some commentators on realself are advising waiting 6-8 weeks? i am hoping to get good results as i have a lot of rolling scars, how long should i wait between treatments?