Trivia: Romulan Time (Cycle): A cycle is a time period similar to the Earth hour. We are told that there is no motion on the Romulan sensors for 20 cycles, Kirk
also logs that they were motionless for 9 hours 47 minutes giving a cycle no
more then 29.35 earth minutes. For the Romulan Day see the Star Trek: The Next Generation episode "Unification Part II."