Waiting Time Between Endoscopic Brow Lift and Hair Transplant?

Always check with the doctor before having another surgery.  The doctor will make a decision.  There is no rule.  In general doctors want you to be completely healed from prior surgery to start another surgery.

I would advise waiting at least 6 months after brow lifting before doing a hair transplant. In 6 months all major healing has happened and revascularization stabilized.
It is also important to position the new hairline after the final forehead length is determined. Waiting 6 months makes this decision more definitive.

You would do better to have an Irregular Trichophytic Forehead Lift with Orbital boney contouring and removal of excess skin and save a great deal of money and hair. It t does look natural as I have done for the past 35 years and thousands of patients.

I would wait a full 3 months before undergoing a hair transplant lowering surgery but check with your surgeon