That is a good question, and I will share my experience and ask a question of my own. I don't think it should take 20 seconds per cycle (I think the Bono book says 10 seconds is about the max). Here's my thinking based on my experience.
One of the mistakes I made when I upgraded to blend is that set the power (HF and to a lesser extent DC) too low and set the time too high. In a way it seems counterintuitive (though it makes logical sense when you see diagrams of the needle heating pattern) to turn up the power and just reduce the time.
After a lot of fine tuning, I got it down to the point where I can epilate my arm hair with the bulb and root sheath (on the anagen hairs) completely intact and create almost no scabbing

I used to run it for several cycles until it felt right (press footswitch, wait for beep, press footswitch, wait for beep...) then tweeze it out. With more tweaking I finally got it down to 2 or 3 cycles.
Here's my treatment example.
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I use an Apilus SM-500, I think the settings are similar in all Apilus models. I am using omniblend mode. Hairs are 60 lye units in size.
At 20% max HF 0.70mA at 9 sec per cycle I was making large scabs and getting inconsistent results. I thought this was "safer" with the HF at only 20% max
At 26% max HF 0.80mA at 5 sec using two cycles I am having great results. I almost halved the time, but increased power just a bit. The only downside to this that the higher the power the more it hurts and at these settings after a while it
really smarts
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One thing I am still having a bit of a time with is exactly how much force I should be using when tweezing the hair out. I have to tug a bit, causing a bit of skin tenting and the hairs "pop" out instead of slide out with no resistance. But the anagens come out intact and look perfect. I don't know if I am undertreating the hair because they don't slide out with no resistance, or it doesn't matter because the fact they come out intact with a sheath and bulb indicates it was treated completely.