This is a negligent attitude towards Spiritual works. No, it's a bad idea.
The number of vibrations of a Rune corresponds to a multiple of its number. And this must be taken into account. The higher the multiple, the stronger the effect. But don't chase numerical indicators, emphasize the qualitative approach. It is possible to vibrate even a thousand times, and there will be no use if you do the work incorrectly.
The principle is almost the same with Mantras, especially Planetary Mantras. The squares are built on mathematically precise conditions. You have to vibrate the Mantra a certain number of times and a certain number of days.
As for the Mantras for daily work with Aura, Chakras and other things, you should also keep track of the number of vibrations. 40, 54, 108, 216 or more times. You need to «calculate» your own strength without exceeding the load allowed for your level. If you exceed the level of load, most likely you will face exhaustion, overwork feeling, or simply the effect will be dissipated, and the Magic program will not be realized because of irresponsible attitude.
Your Soul will not assimilate more Energy from Mantras or Runes than it can. But the opposite is also true: the higher your Soul vibrates, the more pure Energies your Soul will be able to absorb. The power of influence depends on the Purity of the Soul. Purity of the Soul is important because more noble and pure Metal is able to conduct more powerful Forces through itself.