Hi Younggun,
Glad to hear you like the pieces. We are getting more and more customers that want a small pieces that either fill in the temples or also bring the front hair line forward. You should wait 24 hrs before you go into the shower after you apply the units although I've gone in the shower after 12 hours and not had a problem. Given the normal variables of lifestyle, body chemistry, water quality, etc. you can expect to get about 10-14 days from the attachment.
Regards,
John