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Carolina praying mantis ootheca will hatch within 3-10 weeks. If you wish to delay hatching, simply keep the egg case in a refrigerator in a non-airtight container, then remove it 1-2 months before you want it to hatch. Each ootheca could hatch out anywhere from 50 – 200 baby mantis. This is a great educational opportunity for children to hatch these mantis indoors, and release into the garden in springtime.