If klonopin (clonazepam) has such a long half life -- 18-50 hours according to wikipedia -- why do its anxiolytic effects only last 4-6 hours for me?

Clonazepam duration: Here is one possible reason:clonazepam plasma levels are very unreliable amongst patients. Plasma levels of Clonazepam can vary as much as tenfold between different patients.En.Wikipedia.Org/wiki/clonazepam also you are not alone: www.Socialanxietysupport.Com/forum/f30/klonopin-halflife... These half life figures make no sense to me, k helps me for about 4 hours max.