With my BES, messages are received anywhere from 2 sec - 30 sec after being sent (we are on cingular). I find generally if I don't get a message within 2 minutes, I'm not going to ever get it. I can't say I've seen c. 15 minutes delays, ever.
Are you the BES admin? Do you have access to the mail routing logs with the SRP information? Often the errors (if any) in the logs point you in the direction of the problem.
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