Polling retries are controlled by the DCM timeout and DCM retry count attributes. By default, Spectrum doesn't alert when just one poll fails. It retries 3 times with 3000 milliseconds (3 seconds) in between. So, to get your behavior, you could try changing your retry interval to 60000 milliseconds. You can find this under the component details for each device:
There are also global settings for ICMP requests in Spectrum under the VNM icon:
You can adjust these as well. Just be aware that altering the DCM and ICMP values will impact how quickly Spectrum detects an issue in the network.