Not the best way to get plants that will look like the plant it came from. Dyckia's will cross easy with any other dyckia nearby in flower at the same time.
Stolons - can be 6 or 8 inches long maybe longer but that’s the biggest pot I have them in.
A easy way to get more plants with out to much pain
Offsets - new plants form just a little way from the base of the parent plant
Also a easy way to get more plants but with a little more pain.
This is the very hardest way to get more plant and not the beat way to get more plants. You have to cut in between the two heads with out cutting one or the other to badly so they can root. Should wait for the two heads to get larger and it will be a little easier to do.