Everything seems to always be speeding up, so I'd bet on a shorter cycle (3-7 years, to pull numbers out of my ass) before I'd bet on longer cycles (20 years).

Everything seems to always be speeding up, so I'd bet on a shorter cycle (3-7 years, to pull numbers out of my ass) before I'd bet on longer cycles (20 years). Although faster cycles might also mean faster adaptation, soooo.