Welcome to Subliminal Club @AlfaX,
Ultima subliminals were designed as a way to rapidly/instantly shift your state, reality and mood - similar to the old superchargers and stacking modules.
However, that does not mean they are temporary. The best way to explain the difference between Q and Ultima subliminals is not based on the permanence of results, but on their scope.
Q subliminals will be wide in their acting - a subliminal such as Emperor will be hitting numerous parts of your life in order to help you become the man you desire to be. This means changing inner moods, the emotions you use, how you use them, your behavior, your social circle, your employment, your closest relationships, your physical attributes and so on.
It is a wide subliminal.
Meanwhile, you have Ultima subliminals that are extremely focused in their scope. They are narrow - a subliminal such as Executive is solely and fully focused on making you as productive and ambitious as possible and as quickly as it can.
It will not go through your whole life and your whole being, shifting every little cog it can to cause wide, across the board change - it will focus solely on getting you the very specific results you want.
Trying to measure them by timespan is an erroneous approach, because our subliminals will always create lasting change. The question is - will it be a deep, precise drilling or an open-pit mining operation? Choice is on you, but either of the two will eventually make you the man you want to be.
It is just a matter of how you want to shape your journey.