Time needed to confirm IPL beard facial hair loss isn't permanent?

The hair loss should return in 3 months, if it doesn't then you may have gotten a permanent reduction.  Best, Dr. Emer.

Thank you for your question in regards to IPL. Hair follicles grow in different phases and permanent hair reduction will take place with several treatments every six weeks. It may take a few months for your hair to regrow in those areas. To be sure, see two or more board-certified providers in your area for a complete evaluation to make sure you are a good candidate and that it is safe for you to have treatment. I hope this helps.

It is a little unusual to perform an IPL  with only 2 weeks between treatments. It is very possible that the laser has killed off some of your hair follicles.  You should have a better idea how much hair was treated in the next few weeks.  I suggest you return to the clinic that performed this service for followup care.