It really looks pretty good. Yes, I would whack it into several short pieces - ideally, you want a node in the soil. I've often poked cooperative leaves under the soil and used really short pieces to have more in a pot. It's kind of up to you, though. With all the aerial roots, it will root fast, I'm sure. If it feels at all dehydrated, or if your temps are cool, you can put it in a rooting dome to keep the humidity up, but if your conditions are anything like ours right now (very warm, very humid), it would root find just sitting in a shady spot on a porch.

Denise in Omaha

Thanks for the input!
It is pretty warm and humid at the moment (hope it stays like this for a while). So I chopped the stem into several pieces, each with a good bit of roots. I hope I did it right! Theres been a few pieces that didn't fit in the pot so just left them in a glass of water until I get some more potting media.
It is amazing how hard to find hoyas in this country! I've been to dozens of plant shops and garden centres and florists, half of them never heard about these plants :)

That looks fine. Are you using hydroton pellets? I have several that grow very well this way...

Yes, you pretty much have to order Hoyas from vendors. We have a lot of good nurseries around here, but the only Hoyas you ever find are very common ones. Gardino's in Florida is an excellent source for the beginner - they have a nice variety and their plants are amazing and large for the price. In fact, I think I'll go right on over there now and see if they have anything new I don't already have!

Denise in Omaha

Well I am pretty far from Florida :)
Yes I grow everything in semi-hydro except for succulents and a few ferns. Hope these plants will do fine as well!
And at the moment not planning to order new ones. I am now really ran out of space, don't even know where to put all my plants in winter :S
Since I found out there are several kinds of Hoyas with all the different colours and shapes... it is hard to resist :)

*Update*

Potted cuttings are doing fine, though they haven't grown a millimeter yet.
The few pieces I put in a glass of water produced 2 little leaves!
Never expected this 'quick'.
For my pachira cutting it took 5 months to grow a single root lol :D

If the leaves still feel and look well hydrated, then it's just putting it's effort into roots. Once it's ready to grow, it'll probably take off like crazy. Congrats on your carnosa doing so great!

Denise in Omaha