purana kakaj....ur answer is like ur name purana...........

currently, you cannot apply for visa stamping from Mexcio or Canada, if your country of origin is Nepal. USCIS have changed that rule.

Secondly, I have not heard anything from 6-12 months. there were very very very few cases among Nepales who had to wait more than a month or so, and never know anyone who got rejected personally. One case of around 4-5 months, becoz his indian consultancy company has black-listed, he switched the company and got his visa.

I personally did mine on feb 2010. 5 days of total time. tuesday form submitted, got visa inetview on wednesday, got passport with visa on friday.

one thing - it will be on average of 2 weeks during busy season, as their are many students and family aaplying for visa.....

so far documents.....there are multiple links here in sajha as weel as in internet..so i would recoomdn you to do somework on your own........

rest....PEACE