Thanks for the tip from Deepak
I am reading this thread (US F1 Visa interview Experience)after a very long time and I found that almost everyone is wondering what they should mention in Intended Length of Stay column.
There is a section in your I-20 that says, ” The normal length of study is 24 months/30 months/5years.”
It means your university expects you to finish your course in that duration (until and unless you speed up by taking more courses in each semester or slow down by taking only minimum required credits to fulfill F-1 status).
Now, you can include your one year OPT into the duration in your I-20, making your intended length of stay one year longer than what is mentioned in your I-20.
But better you do not mention your intended length of stay shorter than the duration mentioned in your I-20.
However, it is good to include your OPT period into your intended length of stay because VO knows that almost nobody comes back without doing OPT.
Therefore, in my opinion, the best answer for intended length of stay is = normal length of study mentioned in your I-20 + one year OPT.
Remember, the duration mentioned on your I-20 does not include your OPT duration. My current answer may contradict my previous answer but that’s fine.