Galvanic destroys hair by creating a chemical reaction in the follicle, Thermolysis does so using heat and the Blend combines both.
You will get different opinions on which is better depending on whom you ask, but they all three work when done properly.
The pure Galvanic systems were the slow ones that you read about. 3 mins per hair would be extremely slow though and would be on a very low setting.
Galvanic is the mode of the little home numbers.
50 Hrs Pro Electrolysis (Apilus Platinum)
5 Hrs DIY Electrolysis (Silhouet-Tone ST-250)
2 Clearances with Laser on face, arms, pits, chest and stomach