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Your water dish looks like a milk jug cap. If this is so, then your B smithi is well beyond 18 months at that size, it is likely 3-6 years already. But no worries as females can live nearly 30 years and males( depending on mature molt date) up to 12.
I keep my adult female in a10gal tank, and...
Perfectly normal. The larger the prey the longer it takes them to eat it. A 12 hour meal is not uncommon.
If duia are too cute to feed off, then hissers are definitely not a better substitute. They hiss so loudly when impaled by the fangs they almost sounds like they are squealing.