After getting eyelash extensions, it is generally recommended to wait for 24 to 48 hours before allowing them to touch water. Here's the reason:

During the eyelash extension process, an adhesive is used to attach the artificial lashes to the natural lashes. This adhesive needs time to cure and form a strong bond. If the lashes come into contact with water too soon, the water can weaken the adhesive, causing the bond to break and the eyelash extensions to fall off prematurely. Waiting for 24 to 48 hours allows the adhesive to cure properly and ensures a more secure attachment of the extensions.