To find out how long *your* Blazer's remote starter will run, you should:
* Check the installation paperwork: The installer should have provided documentation specifying the run time.
* Consult the remote starter's manual: If you have the manual for the specific brand and model of remote starter, it should list the run time parameters.
* Contact the installer: If you can't find the information, contact the shop or person who installed the remote starter.
Without knowing the exact remote starter system, it's impossible to give a definitive answer.