For remote start, my 2018 Civic shut off after ~10 minutes. According to the sibling comment, their 2021 was similar. Did you have an aftermarket remote start,

For remote start, my 2018 Civic shut off after ~10 minutes. According to the sibling comment, their 2021 was similar. Did you have an aftermarket remote start, or was it started using the actual ignition switch in the car in your case?