PAST PERFECT CONTINUOUS
before, when, by the time, etc, since 2001, since Tuesday, for 10 hours/ days/ years.
PRESENT PERFECT CONTINUOUS
We use the present perfect continuous to talk about an action or actions that started in the past and continued until recently or continues into the future.
since, for, all week, for days, lately, recently, over the last few months.
FUTURE PERFECT CONTINUOUS: By the time (2 clauses, first one using a present tense, second one using future perfect continuous), when, before the end of 2030, before the end of this decade/ century, etc.
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