DSDPlus.txt says that at the end:
Please include a comment that specifies the email address that
your Fast Lane updates should be sent to.
NOTE: IF YOU DO NOT INCLUDE A COMMENT, PAYPAL DOES NOT SEND US A NOTIFICATION.
THIS *WILL* DELAY YOUR FIRST FAST LANE UPDATE.
So the question is did you include a comment?
If not - email them. If you did it, but there is more than 2 days delay - ask them

As long as I remember I received mine the same day.