Thanks both for the replies and advices. It is helpful and encouraging.

@Christopher: Thanks: I watched the video about musical alphabet with great tips about memorizing pratice. I was not aware of that vdeo tutorial series of yours yet. I intend to watch the complete serie this week (music Theory: A brief overview).

@manXcat: Thanks for your experience sharing it is encouraging, I understand that a lot of applied practice will get me there.

I will keep on practicing until associations become instinctives, I will post back the day I pass the fretboard trainer under 60 sec.

Cheers,