Future Perfect Continuous (Future Perfect Progressive Tense)
When do we use the future perfect progressive tense?
We use this tense to indicate a long action before some point in the future.
Ex. I will have been writing novels for four long years next week.
How is the future perfect continuous tense made?
Subject + auxiliary verb will + auxiliary verb have + auxiliary verb Be + main verb + ing
Ex. He will have been playing tennis for five hours straight.

