I agree that C.tommasinianus is quite fast, 3-4 years here. C.veluchensis hasn't flowered yet and it was sown 2019.
C.abantensis was sown the same year, and the ones I planted outside two years ago, are flowering, another pot outside vanished, and two pots in the greenhouse haven't flowered yet.
Perhaps I don't fertilize them enough in pots, and in the ground they get more nutrients, though also it is riskier (because of winters).