How long does an overbite of 10mm take to correct?

It would be difficult to estimate without looking at your photos and x-rays, but it would likely take about 12-18 months if you get one or more teeth extracted.  Also, it will depend on whether you need to expand one arch or reduce the other arch.  A lot of factors come into play, but it can be done.  Whenever dealing with FRONT teeth, always view before and after patient photos online of the doctor that you select, so that you know that the doctor is capable of giving you the results that you are looking for. Good luck and I hope this helps. Follow me if you have more questions.Sarah Thompson, DMD

You would need to have braces first for about 1 1/2 year and then jaw surgery.  Please consult an orthognathic surgeon for further evaluation.