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We use the past perfect continuous to show that something started in the past and continued up
until another time in the past. "For five minutes" and "for two weeks" are both durations which
can be used with the past perfect continuous. Notice that this is related to the present perfect
continuous; however, the duration does not continue until now, it stops before something else
in the past.

Examples:

 They had been talking for over an hour before Tony arrived.
 She had been working at that company for three years when it went out of business.
 How long had you been waiting to get on the bus?
 Mike wanted to sit down because he had been standing all day at work.

Future perfect continuous

Future perfect continuous has two different forms: "will have been doing " and "be going to have
been doing." Unlike simple future forms, future perfect continuous forms are usually
interchangeable.

FORM Future Perfect Continuous with "Will"

[will have been + present participle]

Examples:

 You will have been waiting for more than two hours when her plane finally arrives.
 Will you have been waiting for more than two hours when her plane finally arrives?
 You will not have been waiting for more than two hours when her plane finally arrives.

FORM Future Perfect Continuous with "Be Going To"

[am/is/are + going to have been + present participle]

Examples:

 You are going to have been waiting for more than two hours when her plane finally
arrives.
 Are you going to have been waiting for more than two hours when her plane finally
arrives?
 You are not going to have been waiting for more than two hours when her plane finally
arrives.

NOTE: It is possible to use either "will" or "be going to" to create the future perfect continuous
with little or no difference in meaning.