I gave up after 25 minutes.
Though I think my problem had more to do with the Zoom format than with the play itself.
I believe this is only the 2nd of these online play readings I've seen, and the other ("The Typists") had more interaction between the actors and didn't force the actors to stare intensely at the camera the whole time. The static presentation, the black and white cinematography, the relentless focus on the camera made me extremely uncomfortable and fidgety. So much so that a minor technical glitch during one of the speeches turned into a huge distraction. After a while I found myself concentrating on everything except the characters' relationships, and I realized that this format just wasn't working for me.
I ended up spending my Sunday afternoon watching an online concert (Paul Weller with the BBC Symphony Orchestra at the Barbican) which I found to be very well-directed and produced for a web audience. (It expires this afternoon, though the BBC may re-air it at a later date.)