Dr. J Chakma wrote: “Out of 4 antakkappas a living being spend 3 anatakkappas (i.e. 75% time of a mahakappa) in Brahma realm (Abhassara) and enjoy jhanic pleasure. However, Buddha told this sansara is full of suffering (dukha and dukkha). So, a being even if it spent rest of the mahakappa in apayas, the being still spends 75% of time in Good realm (abhassara realm). So, theoretically a being enjoys more than it suffers.”
That is correct.
But as you said after that, the suffering, while it lasts, is unbearable.
To get a perspective consider the following scenario: If one is given the opportunity to enjoy all the comforts in the world for 9 months on the condition that one would then be subjected to various forms of torture (burned alive, cut into pieces only to reassembled instantaneously and to go through the whole process again, etc) incessantly for the next 3 months, would that be acceptable?
I don’t think one would even agree to one day of such suffering even for 9 months of luxurious living.
P.S. I just wanted to mention a book that I read recently, which gives a good idea of what it is like in the hell (similar to the descriptions of some suttas): “A Guided Tour of Hell – A Graphic Memoir” by Samuel Bercholz (2016). He first describes an “out-of-body experience” that is similar to many given by others (seeing his body from above), but the second experience is a “trip to the hell”.