There was quite a lot of excitement and promotion around the return of Hayden Christensen's Anakin Skywalker to the Star Wars universe in the Obi-Wan Kenobi series.
Of course, all of this is muddled by the fact that in the present day of the series, there is little of Anakin left and mostly all that remains is Vader, who, conveniently is usually completely suited.
Now, this link among others explains that Vader was played by three performers: Christensen, Dmitrious Bistrevsky, and Tom O’Connell. And, in addition, Vader is voiced by James Earl Jones.
So, I am interested in how many seconds of Christensen we actually get.
Ideally, this should be broken down by episode, whether the appearance is on-screen or voice-only, and which appearances are new vs. reused (e.g. from the Prequel Trilogy) footage.
For the purpose of this question, absent any other evidence, I think we can assume that an appearance of a fully-suited Vader is not Christensen, or it can be considered "inconclusive". At the very least during action scenes it is most likely not Christensen.