Gross, most likely.
Especially if you are not conditioned for, or weak at, VO2 max work.
Personally I would find completing the same time at intensity, in more bouts (i.e 8 x 4 or 6 x 6) and gradually progressing more rewarding and encouraging than falling to bits on 4 x 8.
Granted the initial adaption isn’t going to be quite the same but productivity from blowing up 4 times on the trot has to be evaluated too.
That said I have a reasonable VO2 Max performance and having done mostly SweetSpot work the last 6-8 weeks I found Elwell (one of my favourite go-to’s of the past) to be challenging but managable.
Might be a good place to start and then modify the workout.