how much time to get the title jr.member or member in btctalk ?

I think the bigger issue with you is that before today you only had one post and it was in January of last year. And then suddenly you're here. Then there's the quality of your post on your quest to quickly become a Jr. Member. Which I don't think will even matter with your 1 year, 8 months, 14 days without posting. 623 days total.
http://www.wolframalpha.com/input/?i=january+16,+2016+to+today