How do I regulate the length of time the lights

Valve timing may be off. Check timing marks. Also check transmission fluid level.

Check heavy gage wire on the back of the alternator for B+ voltage ?
When the engine is running, the generator turn on signal is sent to the generator from the PCM, turning on the regulator. PCM - engine computer . Take the vehicle to a qualified repair shop an have it checked for DTC'S
DTC B1327
DTC B1513
DTC B1514
DTC P0560
DTC P0620

The PCM monitors the system voltage to make sure that the voltage stays within the proper range. Damage to components, and incorrect data input can occur when the voltage is out of range. The PCM monitors the system voltage over an extended length of time. If the PCM detects a system voltage outside an expected range for the calibrated length of time, DTC P0560 will set.
Action Taken When the DTC Sets
• The PCM will not illuminate the Malfunction Indicator Lamp (MIL).

CHECK ENGINE EMISSION CONTROL REGULATOR,GET DIAGRAM OF YOUR ENGINE FIND WERE LOCATED TAKE OF CLEAN REPLACE,OFTEN HAPPENS ON CORSA CARS ,ALSO CHANGE SPARK PLUGS AS MAY BE MISFIRING LOSS OF POWER WITH WHAT I HAVE SAID .

Could be the alternator , you can have it checked free at most auto part stores . Have them check for DTC'S diagnostic trouble codes as well . The charging system is controlled by the PCM - engine computer , if it see's a problem it will set a DTC and have the insturment cluster turn on the battery light. Plus the way the radio is acting ,it's loosing power .
DTC B1327
The body control module (BCM) determines battery positive voltage through the 10A Cluster/BCM fuse input. The BCM then sends a class 2 serial data message containing the measured battery voltage value. The vehicle control interface module (VCIM/OnStar®) module monitors this class 2 message to determine vehicle voltage.
DTC P0560
The PCM monitors the system voltage to make sure that the voltage stays within the proper range. Damage to components, and incorrect data input can occur when the voltage is out of range. The PCM monitors the system voltage over an extended length of time. If the PCM detects a system voltage outside an expected range for the calibrated length of time, DTC P0560 will set.
DTC P0620
The powertrain control module (PCM) uses the generator turn on signal circuit to control the generator. A high side driver within the PCM allows the PCM to turn the generator ON and OFF. When Generator operation is desired, the PCM sends a 5 volt signal to the voltage regulator via the generator turn on signal circuit. This causes the voltage regulator to begin controlling the generator field circuit. Once the Generator is enabled by the PCM, the voltage regulator controls generator output independently of the PCM by monitoring the battery positive voltage sense circuit. Under certain operating conditions, the PCM can turn Off the generator by turning OFF the 5 volt signal on the generator turn on signal circuit. The PCM has fault detection circuitry which monitors the state of the generator turn on signal circuit. If the fault detection circuit senses a voltage other than what is expected, this DTC will set. The voltage regulator also contains fault detection circuitry. If the regulator detects a problem, the regulator will ground the generator turn on signal circuit, pulling the voltage low. This also causes the PCM to set the DTC.
When this DTC sets, the PCM sends a class 2 serial data message to the IPC illuminating the Charge indicator lamp.

Or it may be more wise to have a qualified repair shop check it out .

The check engine will be on if the key is on but engine not running . This is normal. If the check engine goes out when the engine starts there are no codes present . Did you check the fuel filter . Sometimes when a filter is dirty there is sedement laying in the filter canister . When the pump starts working the flow picks up the sedement and plugs any remaining open screen and stops the fuel completely . The engine stops . When the flow stops the sedement falls back allowing flow again. and the engine will run for another while . If the filter is old it should be changed anyway . Also when the engine stops check to see if there is spark at the spark plugs while cranking the engine .

try using a scan tool to reset the ECM
having a battery disconnect for any length of time can corrupt the CPU program in the ECM

you should use multi diag office i-2010 to check your engine and use this tool to clear fault codes.

it could be a bad fuel pressure regulator. or a blocked fuel filter. heres the regulator symtoms. the vehicle runs rough, the engine will not start ( usually in the morning )many times engine starts but stalls shortly after starting. a bad regulator can result in fowled spark plugs, replacement is only cure. ( black soot on plugs, blake smoke from tail pipe, running rough and stalling. check fuel filter first.

Have the computer scanned for trouble codes.

YEP ALL TODAY CARS COME FROM THE FACTORY WITH DAY TIME RUNNING LIGHTS WHICH STAY ON WHILE YOU DRIVING.IF LIGHTS STAY ON WITH ENGINE OFF YOU HAVE A FAULTY DRL RELAY OR DAY TIME RUNNING LIGHTS RELAY.YOU COULD HAVE TURN ON HEAD LIGHTS MANUALLY FROM THE SWITCH.WHICH WILL CAUSE HEAD LIGHTS TO STAY ON.