What’s everyone’s Dual-N-Back experience? Any further explanation on how it works?

Hi, I've used Dual-N-back for almost 2 weeks since I read game changer. Now I’m at N=5 Few questions below
1.Quoting from Dave, this app does work, is there any further explaination of how it works, like science research?
2.Dave suggested 40days non-stop training, and I assumed most of people will reach average N=8 while 40 days, so is it worth to keep doing it after 40days? Or there will not be obvious effect after that so just stop around N=8?
3. Does Dave mention what his max N levels is?
4. I do imagine the letter sound in my brain while pressing, without muttering, does everyone do the same?

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