Kibana watcher alert when error log rate exceeds 1 per min for 1 hour

[Chenyang_Liu]

I would like to setup a Kibana watcher to send alert when error log rate is over 1 per minute for one hour.
So I set a scheduler interval to 1m, then query log.level: ERROR to get the error count for 1 min
But after that, how would I achieve alerting only if it last for 1 hour?
Thanks for your response

[Nathan_Reese]

What version of Kibana are you running?

In 7.10, you can specify For the last time range block. Set this to 1 hour.