Forming future perfect continuous tense questions is nearly the same as future perfect tense, but with an additional "been" and the main verb is in progressive verb form (verb with -ing).
Using "Will":
Example:
1. She will have been running every day for fitness by end of month.
2. We will have been waiting for the bus for thirty minutes by the time it arrives.
3. I will have been taking yoga classes for stress relief.
4. He will have been coaching the team for several years.
5. They will have been studying the new software after its release.
