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The present perfect continuous (have/has been + verb-ing) emphasizes the duration of an activity that started in the past and continues now, or has recently stopped with visible results.
I am studying since 9am.
I have been studying since 9am. — Use the present perfect continuous with "since."
She has been study all morning.
She has been studying all morning. — Add -ing to the main verb after "has been."
have been waiting
hasn't been feeling