Effects - how long should SWIM wait for ketamine tolerance to disappear?

[icantremembermylegs]

This guy i know had his first experience with KET last weekend, (friday 8th) he must have sniffed about 100mg, he then lay down and all was goooood (numb, disconnected, like a solitary floating entity in an infinity of pitch black nothingness)

however the following monday, (11th) he had about the same amount again and it wasnt very good atall.. he decided to wait a while, and sniffed about twice the original amount the following friday (15th) and didnt feel atall numb, just a bit relaxed and disconnected.. (obviously didnt wait long enough)

he then had about 200mg the following morning and again was disappointed

he'd like to know how long he should wait for his tolerance to return to zero
(will it ever return to how it was before the first time?)
so that he can have another trip like his first if not better (more mg)

He is very greatful for any help/assistance (he is a K n00b)