This stuff is awesome! There is no need to purchase expensive lash adhesives, because this stuff works! I have used it multiple times and it seriously does hold the lashes in place as long as you take care of them and don't do anything that would normally damage them. :) They say it usually lasts about three weeks, but depending on your lash growth cycle, and if some individual lashes fall out, that time frame could be shorter. Mine usually lasted about two weeks. The only downside is the removal process which was at times difficult until you truly get the hang of it.