This
14 consecutive days OR 4 times 5 consecutive days separated by 2 days off. If you keep taken them after this period you will have desensitization and consequently diminish, loss of effect.
and this
As with all neuropeptides.... and noopept, after you stop taking them you will have withdrawal symptoms on the third day after you stop, and that's all, just one day. The washout is 2 months, for all of them.

Regarding your first quote:
Cerebrolysin:
"A normal dose is about a 5ml ampoule injected either in the muscle or in the vein each day for 5 days, then repeated for a period of 4 weeks. After a 2 month treatment break, the cycle is repeated."
"Duration of Treatment 10 - 20 infusion days. "
That's the standard protocol used by doctors worldwide for cerebrolysin.
Source: (couldn't find better ones)
http://www.antiaging...94-cerebrolysinhttp://www.schumit.c...ult.asp?pgid=57Noopept:
"After 14-20 days of treatment revealed a positive effect of the drug on cognitive function, attention and memory options."
"The duration of the course of treatment is 1.5 - 3 months. Second course of treatment if necessary, can be done in 1 month."
Source:
http://translate.goo....ru/instrukcia/Semax:
"Semax ® nasal drops 0.1%...
The drug is administered daily for 3-5 days, if necessary, treatment extend to 14 days"
"In severe stroke at a time is entered with 3-4 drops in each nostril
...
The drug is administered daily for 10 days."
The dosage increases, the duration of treatment diminishes.
Source:
http://translate.goo...dex_id_5678.htmIn all of the three peptides you can increase the dosage and diminish the duration of the treatment or you can extend the duration of the treatment and diminish the dosage.
For a regular dosage, 5ml IM cerebrolysin, 20mg/ day noopept or 2, 3 drops in each nostril of semax the treatment should be 14 consecutive days or 4 times 5 consecutive days. If you extend this you will get progressive desensitization. I say this based on sources (not necessarily the sources above) that i researched and my own personal experience.
Regarding your second quote:
My extensive personal experience on all three.