That's not normal at all, something is wired incorrectly, where was it installed? Also the turbo timer can be adjusted with the valet switch. You can have either a 1 minute turbo time (default), 3 min, 5 min, or 10 minute. In order to change it make sure you can reach the valet switch.
So once you have that switch in hand and your remote, open the door, turn the key to "Run" (without starting) then press and hold the valet switch. It should chirp once, but keep holding it until it chirps 3 times. Now to get to the turbo time setting, you must press the switch 7 times then press once more and hold it. It should chirp the siren 7 times - Do Not Let go of the valet switch yet. To select the 1 minute turbo time, just hit the Lock/Arm button on the remote. To switch between 3, 5, and 10 min, use the unlock/disarm button to toggle through them. 3 mins is 2 chirps, 5 mins is 3 chirps.. etc... When you have what you want, you can let go of the valet switch and close the door. All done
If at any point you screw up, ie; it doesn't chirp 7 times, just shut the door, or turn on the key then off to get out of the programming mode, then try again.