What's the recommended time to wax before laser hair removal?

I wouldn't recommend this, you want a proper treatment to be done and see great lasting results, I suggest shaving the area only before and in between your laser sessions.

Best of Luck 

We ask that patients do not wax in between treatments, but rather, space their laser sessions closer together to obtain good results. Raffy Karamanoukian Los Angeles

Dont wax before any type of laser hair removal session, couple weeks later the hair will grow out and it will be a waist of a laser treatment, shave only in between treatments. Good Luck

You should not wax 6 weeks before starting laser hair removal and then do not wax again.  You can shave instead.  The hair needs to be in the follicle for your next laser treatment.  For the face, treatments are usually performed 6 weeks apart, but other areas are treated 8-10 weeks apart.  Remember to avoid the sun before and after your laser treatments.  

Thank you for your question. It is not a good idea to wax before you get a laser treatment. Laser target the pigment in the hair follicle and by pulling out the follicle you have nothing for the laser to go after. If you are getting laser treatments just stick with shaving in between and you will have a much better result.
 

The following are my recommendations for preparing for laser hair removal:
1. Prior to laser treatment, it is important to shave the area. Otherwise hair gets pressed to the surface of your skin. When the hair shaft is destroyed by the laser it can injure the surrounding skin. Shave a day prior to your appointment, so if you nick yourself, the area will not be bleeding during your procedure. Any method of hair removal such as waxing or tweezing will remove the deeper portions of the hair follicle which contain the "target pigmentation" and will render laser hair removal ineffective for at least two weeks. Either shaving or depilatory creams can be used up to the day of the laser treatment as they do not remove the entire hair shaft.
2. Make sure the area has had no sun exposure for one month prior and one month after the laser procedure.
3. The use of any photosensitizing medications or over-the-counter supplements known to cause photosensitivity should delay laser hair removal treatment until these medications can be safely discontinued.
4. Topical retinoids used in the treatment area should be discontinued 1 to 2 days prior to treatment.
5. If a tan is present the treatment should be delayed until the tan has faded.
6. Make sure there is no inflammation in the skin of the area to be treated prior to the procedure.

It is not a good idea to wax before or in between laser hair removal treatments. Laser hair removal targets hair follicles, and waxing pulls out hair follicles. So if you are waxing before or in between treatments, and the follicle doesn't have time to recreate itself, the laser has nothing to target and the laser hair removal simply won't work. Four to six weeks is only recommend for specific places on the body. Not all hair grows at the same rate so treating some areas, like the legs, every six weeks is unnecessary. Leg treatments should be done every three months. I don't know where you are being treated, but I wanted to point this out.