I have transferred 500 DL miles 4X. Usually the miles post within a couple weeks. They seem to come in spurts, although I generally get a reminder email that I have "earning opportunities" every couple weeks. Lately, my offers have been heavily focused on charities and also ZERO miles unless I purchase something rather than the double-option offers ("Earn 5" when you view, "Earn 100" when you buy).

I have never bought or subscribed to any offer. I just go for the 5 miles a click.