I use the same ratio of fragrance oil to beads that you use. Some take as little as 1 day while others take a week. Usually I shake the jars a couple times a day. Some scents take longer to absorb than others.
What size ECO would be equal to a 51Z wick? I might just give them a try with the 4630. I use them in pure soy but didn't think of using them with the 4630.