Perrybhadra,

I am not currenty on OPT so could nt tell you in detail about 3 terms of extension.  from what i read and know, 90 days applies during your first year of OPT and additional 30 days apply after you extend your OPT to 29 months.  however, i am not sure if you can use 120 days after getting your OPT extension.  my guess is, you can not have more than 30 days during your OPT extension period.  best person to contact is always international office or those who recently extended their OPT.