I started a linckia rescue thread elsewhere, but ran into this discussion. How long on average does it take for the chocolate chip to grow back the legs once amputated?
Agreed with livinlifeinBKK that regeneration time varies dependent on a number of factors, so I don’t know that an estimate would carry over well from one star to another.
That said, for a very rough estimate for most stars, from what I’ve heard, depending on conditions and the individual species, a healthy sea star should be able to start recovering from serious injuries (like lesions or lost limbs) within ~3 months. For full recovery from a serious injury, I’d guess a timeframe of ~6-9 months wouldn’t be too unrealistic. Again, though, this is a very rough estimate, and very dependent on a number of factors including the severity of the injury.
Now, with that out of the way, I’m hopeful someone will have a good answer to your question, because I’m curious if anyone has hands on experience with starfish regeneration for chocolate chip stars.
(As a side note here Saltyanimals, you could probably also ask the person whose Nardoa star regenerated limbs what the timeframe was for that - you can find them/their post in the quote I left on your Linckia rescue thread; the more data from the more species, the more likely you are to get an accurate estimate).