With two events (events that have walked for a Future Perfect Continuous use another incident the Simple Present)
You Will have been Waiting for hours when the Two Plane arrives.
You'll be waiting. For two hours When the plane arrived
at 10 o'clock tomorrow, assuming the plane will arrive and you need to pick up a friend at the airport. Then someone says this, It means you have to get to the airport about 8 o'clock (slower than this he can not), then you have to wait until 10 o'clock that.
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