Customize capacity to round to more granular levels

Hours is a fairly ridiculous estimation metric for a large project being planned for several months hence and requires a lot of cognition to reason about. Yes, we can do math and convert, but the UI shows hours in many places and when it shows days, it still shows a false level of precision. Such views should round to weeks or months and use decimals sparingly. (I.e. 3.5 months would be ok, but 3.423 or even 3.4 would not be.)