Time gap between nd yag laser sessions for hair removal. Help?

Depends on the site. Lhr is most effective on dark, thick, actively growing hair-rarely more than 20% in any area. Most hairs are in "rest" phase -- fairly immune to all wavelengths and energies. You have to superheat the stem cells in the bulb and bulge of the growing hair follicle in order to kill it - not just make it a smaller, lighter (poorer) target. It takes 5 to 8 sessions over 2 years to get 70+% kill rate.
4-8 weeks. Ideally you should wait 4-6 weeks between sessions to allow the hair cycle to shed the lasered hair and any regrowth of hair follicles to occur.

Related Questions

What are the merits & demerits of nd yag laser for hair removal?

It's all good. The good news is it will remove your hair the bad news is that it takes 3-4 treatments that can be uncomfortable and it does not work great on darker skin. Read more...
Efficient . It could be efficient wight the right setting for hair reduction. However, it works best on black hair on white skin. Gray hair will not be affected. Read more...

Can anyone tell me is yag laser hair removal way to go?

Depends on skin type. The yag is a good laser for darker skin color because it is less pigment sensitive. That said it can be safely used on all skin types. The yag will generally perform a good hair reduction. If you are light skinned there are other lasers such as the diode 810 or the alexandrite which may have a better (slightly) response. If you like the person you saw go ahead the yag will work. Read more...