Mine's also doing a little over an inch in four months. As far as I've heard, that seems pretty standard. So, with the size most porkies are commonly sold at in the trade, I'd say maybe something like three years? Just a guesstimate.
For some reason, I've rarely heard of people on RC with full or near-full-grown porcupines puffers in their tanks. Almost everyone I've seen has 3-6" puffers.
It would be interesting to get feedback on growth speeds from people who have actually owned one through it's entire juvenile to adult growth.
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