Tried 5x5x3, after I used extender.

I did 5x5x3 (air pump, squash jelq, air pump, squash jelq, air pump squash jelq.) I can tell you, that it was awesome. One Major benefit seems to be that I was able to use more vacuum 10hg, instead of 5hg. I could of done it using bathmate, but I wanted to be able to control vacuum and see how much I can use vacuum. Squash jelqs are a Game changer. Penis is much more fuller, without water build up. I used extender after for 2 hours (phallosan plus with penis cap).

Do you think that 2 hours extender use is enough for length gains? I am using it with quite hard tension (got to 20cm stretch). What do you recommend for use time per training day?

Glad to hear 5x5x3 went well. It really is the fastest way to gain girth. Wearing extender for 2 hours is a fair amount of time. Try to get 3 if you can