It depends highly on the variety.
In Malaysia, hybrids of the African tall and the Malayan dwarfs are planted (typical x nana). For example, the Mawa hybrid (Malayan Yellow Dwarf x West African Tall). Under suitable soil, good weather, and fertiliser regimes, in addition to good planting densities, this variety can yield more than 28,000 nuts/ha/year after 8-9 years (according to recorded yield profiles) and reach as high as 30,000 nuts/ha/year. It can fruit as early as 36 months.