User blog comment:Pigzillion/How come Killua learnt Nen so late?/@comment-26566783-20150809190113

i think they wanted to do steps i there training e.g.

1. basic fighting ability

2. withstand torture ( witch also open up deffrent transmuter abilitys)

3. assasins training

4. streanth

or it could have been doing it on diffrent days like mondays torturer day