Point 71 in the category of PAST is defined as:
the present perfect continuous to focus on a finished activity in the recent past but where the effects or results are still important or relevant.
The only example given in the EGP follows the structure:
_jj _cs * have|has been _vvg
However, iWeb does not allow searching for it. The NOW corpus allows _jj when * have|has been _vvg
but it is incredibly rare with only single examples. The most decent shorter Ngrams we can get are on NOW corpus for:
1 WHEN THEY HAVE BEEN DRINKING 31
*this example is not one finished activity in the past though.
2 WHEN INFLATION HAS BEEN RUNNING 28 (almost all of these 28 are identical quotes)
- This has all happened at a time when inflation has been running at about half those rates.
3 WHEN YOU HAVE BEEN WORKING 25
4 WHEN YOU HAVE BEEN PLAYING 24
5 WHEN THEY HAVE BEEN WORKING 16
6 WHEN YOU HAVE BEEN DRINKING 16
7 WHEN IT HAS BEEN RAINING 14
8 WHEN FGV HAS BEEN TAKING 10
9 WHEN HE HAS BEEN DRINKING 10
10 WHEN HE HAS BEEN PLAYING 10