Hair Club for Menz does a 'hard bond' which lasts 4-6 weeks. They sell a bottle of a product called 'Alive.' The customer squirts it on their head through the base. It's an enzyme that 'eats' the crud that has accumulated on the scalp. It feels so much better to have the ability to remove the unit when you want, clean your scalp, and do a fresh attachment. I agree with Xeon--going a month or longer is not sanitary.
Regards,
John