Also, check out the middle part of beta.glitch.com/forum/gener... regarding the law of diminishing returns as you learn more skills (stoot's post).
This "compunding" is a recent change to skill learning times, so I think we're all interested about how it will change our learning strategies going forward. Whether to focus on one set of similar/dependant skills, and how the Better Learning skill applies to that in reducing future learning times.
Also, consider how donating to shrines also impacts learning times as well.