This cycle has been appropriately named the 'dark moon'. The cycle from one dark moon to the next is called a lunation and an average lunation calculates at about 29 days, 12 hours, 44 minutes and 3 seconds (roughly) To be fair, it does deviate in relation to the moons erratic orbit patterns and is affected by the gravity conflict between the sun and the moon.
Traditionally the Moon Boot came in a longer length in a style that was non-tapered. While this style is still the more popular one, a shorter version and/or a more fitted one also exist. Once again the decision as to which one is better is a matter of personal choice. Of course not all retailers may have all material range, colours or styles available.
Cassini wasn't originally designed to spot signs of life in the Enceladus plume. In fact, planetary scientists didn't even know that the plume existed until after the spacecraft reached Saturn.