From what I know it can take forever for a pearl to actually to form, if that's what you're asking. After all, they happen when a grain of sand or something else tiny gets in and the oyster protects itself from it by covering it in lots of materials. So it would take many years.
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My tanks (so far  )
5.5 gallon Planted Dwarf Puffer tank (2 Dwarf Puffers and a lot of RCS!)
16 Gallon Planted
(GBR pair, 3 amano shrimp and a whole bunch of snails!)
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