A lot depends on your climate, how large the plants are, and how you take care of them.
In a hot, dry climate, A. obesums will go dormant unless kept well watered. Same is true with chilly, dry winters. (Cold, wet weather may cause root rot.) Our winters here in southwest Florida are mild, with lows in mid 50's and high's in mid to upper 70's°F, and as I mentioned above, I don't let my Adeniums dry out even during our dry season, so they never go dormant.
My large Adeniums range 3-4' tall above the soil line and are multi branched. All stems don't start budding at the same time, so the flush of blooms lasts quite a while. I have noticed that by the time the last buds are spent, the plant is almost ready to start budding up again. Sometimes by the time the slowest stems to bud are finally blooming, the earliest ones are developing buds again. If the plant is small with only one or two stems, the bloom cycle will seem relatively short, with longer periods between blooming.
There is a very large potted Adenium at Busch Gardens in the Tampa area, the plant being maybe 5-6' tall and 4-5' wide. I'm not a frequent visitor, but I've never seen it out of bloom.
I do know that with my plants, a surprise temp drop at or below 40°F, or a period of sequential daily rains with high humidity will cause the buds and many leaves to drop. I should add, that during winter or spring, when humidity is low here, rains do not necessarily cause bud-drop. But if the buds can't dry out fairly quickly, they will die.
Sorry I don't have a more definitive answer to give, but hope this helps anyway.
