How much time does it take for the clearance of B1/B2 US Visa if it is under 221 (g) ?

How much time does it take for the clearance of B1/B2 US Visa after submission of all requisite documents (Like CV, inivitation, Publications etc.) ? What is the chance to get it approve?

my case is like yours, i had interview for B1 on May 8th , Passport retained & issued 221g. still waiting for update,

thanks

elan

Did your visa get issued