Plan for a series of microneedling sessions, not a single visit. Two sources give ranges you can hold your provider to.
What the sources say
Cleveland Clinic says most people need multiple microneedling treatments, usually about three weeks to eight weeks apart. The AAD gives an example: if your dermatologist is treating acne scars, you may need three to five treatments, which are performed every two to four weeks.
The two ranges differ, so ask your provider which one fits your plan.
Research that pairs microneedling with other treatments
For research, see the PMC trial on PRP with microneedling in androgenetic alopecia and the PMC study of radiofrequency microneedling with a thulium laser. Both show how microneedling is paired with other treatments in research.
Asking for the plan in numbers
Ask for the planned number of sessions and the gap between them before you pay for the first one.