Interesting point about how long I'd waited. It was ~24 hours this morning when it looked so dark (but felt dry). To my amazement, when I got home from work this evening after a very long day... it was notably lighter! Now I feel silly for asking the question.
Since I am new to this I don't have a routine down pat -- I am working on small projects so both for the testing and actual project, I used a wool dauber, and applied it in a circular fashion, but I may have been more liberal with amount of dye I applied on the real project than when I did the test. I guess consistency will come with time and practice.