The future perfect continuous, also sometimes called the future perfect progressive, is a verb tense that describes actions that will continue up until a point in the future. The future perfect continuous consists of will + have + been + the verb’s present participle (verb root + -ing).Grammarly, “Future Perfect Continuous“
By the time you read this, you will have been flying home across the ocean without a WIFI connection for over twelve hours.
You will have been wondering for half a day when the wheels of the plane touch the tarmac.
You will have been agonizing the entire time when the other passengers amble out of the plane.
They will be tired when they arrive home because they will have been flying for twelve hours.
Even though they will have been sleeping off and on across eight time zones, they will still be relieved to be home.
You, on the other hand, will have been feeling nauseous for the entire flight as you arrive at your apartment.
On Sunday morning, when you unlock your door, we will have been living apart for a little over a year.
When you turn on your laptop, we will have been trying to make things work for the past two years.
How long will we have been struggling with our needs when you finally open your Outlook?
You will have been denying the answer for over twelve hours by the time you finish my email.