Satori is always instant and comes about by itself, quite without your effort. Effort indeed is motion away from Satori.
When the universe is left to do itself and the person sees they could be no place else, that life could be no other way, then Satori may occur.
Sit for a million years and you may keep Satori away by just the idea you are doing this to achieve.
Let life be and be, and Satori will come about all by itself.