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USE : Duration Before Something in the Future

We use the future perfect continuous to show that something will continue up until a particular
event or time in the future. "For five minutes," "for two weeks," and "since Friday" are all
durations which can be used with the future perfect continuous. Notice that this is related to
the present perfect continuous and the past perfect continuous; however, with future perfect
continuous, the duration stops at or before a reference point in the future.

Examples:

 They will have been talking for over an hour by the time Thomas arrives.
 She is going to have been working at that company for three years when it finally closes.
 James will have been teaching at the university for more than a year by the time
he leaves for Asia.
 How long will you have been studying when you graduate?