Those 2 ginormous ones in the tan pots I have never repotted since I put them in those big ones. I have to tell you that the big one in the black pot is going to the compost heap. It never did bloom much, not like those other 2. The smaller one with the pink blooms is now residing in the black pot.
I know I should probably root-prune those 2 big ones, and there can't be much potting medium left in those pots, but I don't think I can manage that job myself, and the SU would no doubt whine if I asked for assistance.