Doing this just extends the time -it will still shutdown. It will NOT stay running. GM acknowledged some people need to keep it running and you can buy the program and have installed at the dealer that will disable it altogether. I cant remember its either 30 or 60 minutes then it will shutoff when doing the hold key thing? We had the same issue on vacation with our dog in a 2021 suburban. Every cycle had to hold start button, but it gave us alittle more time when stopping in a restaurant. We still set the timer on our cell phone to alert us to go check the truck. I am considering the program for my currect truck, as it defeats the time out completely.