This NFIRSGram explains the 20-minute response time warning message in the National Fire Incident Reporting System (NFIRS).
The 20-minute response time warning sometimes confuses fire department personnel when they are reviewing the error report for their NFIRS incident submission. A common misconception is that this warning message prevents fire departments from saving their incident in NFIRS: it doesn’t.
Users who receive this message can save the incident in the national database. The purpose of the warning message is to make sure that the response time is legitimate and not a data entry error.