The big Blaberidae (Blaberus and the Archimandrita and Hisser) might live about 2 or so years for adult females, but adult males having a much shorter life span probably. As nymphs they can grow much slower if kept at low temperatures, so I'm wondering if it would take over a year or even much longer to mature from nymph if kept artificially at cool temps even during summer time. Not sure if they would do alright for a long time at cool temperatures or if they would really stop growing or just grow much slower because I haven't tried it. I don't know about the other kinds of roaches. The adult males of Parcoblatta species I have had had a very short life span.
It's getting close to two years for one male Blaberus chacoensis nymph to become adult since I got him from Kyle Kandilian. A wild guess I maybe got him when he was around 3rd instar.