Liquid Gold question

I always get 7 weeks easy. Sometimes the very bottom row needs replaced sooner. I just took out LG/wefts a week ago that were at the 5 week mark and they were still strong and secure, I only took them out to replace the crap hair I had in. I used to do ALOT of bonded wefts, and always got no less than a month (usually its the bottom row that loosens and slides first and sometimes just redoing that will pull the install through a few more weeks) generally every install I did lasted on the average of 7 weeks, but also using the sandwich method. Ive seen some only last 2 weeks without the sandwich method.