If it's working, the alarm will sound within a few minutes to half an hour of constant exposure. They don't always alarm immediately the way that a smoke detector does. CO detectors should be part of every home's safety program.
System. debug() lets us print any values in our Apex code for debugging purposes. This can be very useful for debugging any errors you encounter. We can access the debug logs from the developer console, there are also some IDE's that support debug logs in Salesforce.
No, just hourly pay.