I have one in a 20 inch pot.It came from 18 inch pot.I can't go bigger cause then would not fit the stand.I didn't give it much new room when transplanted it,but removed a few plants one to neighbor one to SIL and a trade.I think one of the
flowers fell off and re rooted itself in a pot below it...and its still blooming.If I go a bigger pot....will have to do a plant hanger for it.They root easy.I have another weird succulant thinggy(I forgot its ID...old forum as well& did as you too)Looks like kalonche with blueish leaves that turn reddish in sun& has blooms like mother of thousands.I even had a leaf of it fall on floor in GH and when I found it it had formed babies on the edges of leafs& THATS formed a nice plant as well in a 8 inch pot.
My roots we're a tangled mess in the shape of the pot holding very little soil.I know my plants roots got air.I transplanted cause wanted the pot it was in at the time for another plant.I know they like to be slightly rootbound.They would likely stop flowering or drop leaves if we're too rootbound& mine was blooming durring the transfer.I mixed some grit in my soil when transfering.I kept what gravel was still left after washing it as well and the few broke pot pieces.I have smaller different colored one.peach in a 10 inch pot.