visitor visa

[drortho]

i have a one medical international conference in march 2010, by profession i m doctor and had secured job in india, my wife is doing post graduation in anaesthesia, aprox.how many month before should i apply for visa? i havent visit any country outside india, one of my friend is sponsoring me who is doctor in US in a good position, is it OK. or i should self sponsored?.i have a inviatition letter of conference and official registration for the same with all registration fee paid which is around 1000USD, planing to visit US for 15days,how is mine chances of Visa?

[immihelp]

You can apply at any time.

However, please note that you must travel within the validity periof of the visa. Therefore, don't apply too much in advance.