This task involves creating answers to complex questions, from a given passage. Answering these questions, typically involve understanding multiple sentences. Make sure that your answer has the same type as the "answer type" mentioned in input. The provided "answer type" can be of any of the following types: "span", "date", "number". A "span" answer is a continuous phrase taken directly from the passage or question. You can directly copy-paste the text from the passage or the question for span type answers. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words. A "number" type answer can include a digit specifying an actual value. For "date" type answers, use DD MM YYYY format e.g. 11 Jan 1992. If full date is not available in the passage you can write partial date such as 1992 or Jan 1992. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words.

Passage: Odes 1-3 were the next focus for his artistic creativity. He adapted their forms and themes from Greek lyric poetry of the seventh and sixth centuries BC. The fragmented nature of the Greek world had enabled his literary heroes to express themselves freely and his semi-retirement from the Treasury in Rome to Horaces Villa in the Sabine hills perhaps empowered him to some extent also yet even when his lyrics touched on public affairs they reinforced the importance of private life. Nevertheless, his work in the period 30-27 BC began to show his closeness to the regime and his sensitivity to its developing ideology. In Odes 1.2, for example, he eulogized Octavian in hyperboles that echo Hellenistic court poetry. The name Augustus, which Octavian assumed in January 27 BC, is first attested in Odes 3.3 and 3.5. In the period 27-24 BC, political allusions in the Odes concentrated on foreign wars in Britain (1.35), Arabia (1.29) Spain (3.8) and Parthia (2.2). He greeted Augustus on his return to Rome in 24 BC as a beloved ruler upon whose good health he depended for his own happiness (3.14).
Question: How many years was the period where his work showed his closeness to the regime and sensitivity to its developing ideology?
Answer type: Number
3.