Roaches typically take 3-8 months to develop into an adult. They typically don't live for more than a year and a half. Source(s): http://en.wikipedia.org/wiki/Cockroach and personal knowledge. Zombie Roach Â· 6 years ago.ife cycle: http://www.vtaide.com/png/cockroach.htm PS It depends on roach species, environmen and temperature how long it takes to maturity.