The average time a lash extension can take is 1 hour 1 1/2 hour for an experienced technician (some particular cases can require longer).
Remember to really talk about the look of your lashes. Longer is not always as important as volume and volume is really what gives you the "wow you don't have mascara on? " effect.
Ask if your technician knows how to put bottom lashes on. They look amazing and you just need a few in the outer corner for effect. Bottom lashes are worth the extra few minutes and extra charge.
If your have problems with your extensions your technician should be there for you and prompt communication is important.
Remember, you get what you pay for. Lash extensions are a tedious process an only a trained technician should be doing it. So pay for the quality of work, products, sanitation, and eye protection you deserve. You only have one set of eyes.
For more information, please see http://www.redlotusskincaresalon.com/lash-extensions.html