Not too sure but it shouldn’t be a loss thats noticable.

Lots of info out there on Google. Lash extensions last through a full growth cycle of natural eyelashes, typically six to eight weeks. That said, because each person’s lash growth is somewhat variable (just hair growth), I suggest light lash maintenance every three to four weeks to maintain a full look. From what I hear it is important to care for your lash extensions well though; Very gently rub your eyelid and avoid rubbing your lashes. When you need to clean your lashes, use your lash wand and gently brush through your lashes. Omit Oil Based Products: Any skin care products, creams or cosmetics that are oil based are a ‘no-no’ when it comes to lash extensions.

The person that provided the eyelash extensions should be able to provide you with a response and assist you if the results are not as expected.
Also; look at beauty pages and forums and they may have some suggestions for this issue. Someone else may have experienced the same issue.
Good luck with getting an answer.

Inquire with the lady who did them. I would say that you should still have all of them in after 10 days or maybe have only lost a couple. But you shouldn’t lose lots in that short amount of time.

Goggle has heaps of advice etc and I am sure it can answer your question plus more.