The manipulation spell "Influence" will expire after (net hits) minutes.
But for the critter power "influence" there is no such restriction. The target is only able to resist the working magical power, when confronted with the wrongness of the sugestion.
Does this mean, a sugestion, that the target will or cannot resist, will work forever?
Eg "You love the color blue", "You want to visit this musem every sunday", "You never want to touch a weapon again", "You want me to be your best friend", ...
If the targets willpower+logic is less than the force of the power, these suggestions would (by RAW) work forever.