The present perfect continuous shows actions that occur in the past but continues up till now. In other words, there is a duration or a period of time. The words for, since and when are used to indicate duration.  Look at the examples given below:

Present Perfect Continuous timeline

Past actions till now

1. He has been staring at that girl for 5 minutes.
2. You’re late. We have been waiting since 10:00 AM.
3. Lately, I’ve been eating takeaways (or takeouts) as my parents are away.

Take note that in the present perfect continuous tense, you have to use the phrase “has/have been” followed a verb with “-ing“. In addition, notice that the word lately is also used as well to show duration.