The average cockroach egg takes about 2-3 days to hatch. Hope that answers your question. Sexy. The incubation of the cockroach egg sack takes from 6-8 weeks depending on the â¦ type of cockroach.he average cockroach egg takes about 2-3 days to hatch. Hope that answers your question. Sexy. The incubation of the cockroach egg sack takes from 6-8 weeks depending on the â¦ type of cockroach.