Time in Britannia passes quickly compared to our Earth time. In 2 Earth hours an entire Britannian day will have passed. Twelve Britannian days makes one Earth day. Just as on Earth, a Britannian year has twelve months. Each Britannian month, however, consists of 73 days. This makes a Britannian year last 876 Britannian days, which is 73 Earth days. One Earth year equals five Britannian years. The release date of Ultima Online was in the Britannian year 289.