Longer Message Light

Is there a way to make the LED light last longer than 15 minutes? I could have sworn it would flash all night but now since I did a battery pull in the middle of an MMS it stops flashing at 15 minutes. Did I jack up my phone or is a normal? Thanks.:rolleyes:

15min is normal.

bbAlerts (3rd party app.) allows some other parameters (1,3,9min), as well as different color led alerts.