Please be prepared to submit your extended appointment letter from FCCC or AOH. The form DS-2019 will be extended for the duration indicated  on the appointment letter. 

This  application you are about to submit will extend your J-1 status in the U.S. 

If you are  sponsored in the "research scholar category" you  are permitted to remain in that status for five years, inclusive of time spent at any other universities since you most recently entered the U.S. in J-1 status.

If you are sponsored in the "short term scholar category" you are permitted to remain in that status for six months

This application  will not extend  the J-1 entry visa stamped in your passport. The entry visa can only be obtained outside the U.S. and must be unexpired at the time you seek to re-enter the U.S. in J-1 Exchange  Visitor Status.

Any question regarding extending your passport should be directed to your home country's consulate or embassy in the U.S.