Has anybody gotten the 750 united mile bonus for signing up? How long does it usually take?
My mother joined March 2, 2010 and just yesterday (April 3, 2010) her 500 UA miles for joining posted to her UA account.
I think the key might be "keeping an active account" as it was listed as a requirement of getting the miles; i.e. earning points every day or two. All she ever did was to sign-up, complete her profile, and click on an e-mail (or two) every day or two. She only did free activities to earn points .... she didn't do any purchases or other non-free point earning activities. But, she is actually enjoying her membership and intends to start doing more (i.e. non-free activities) when appropriate.
Good luck; I hope you get your points!