How to set up a trigger in Zabbix?

Question

Zabbix

Got a trigger

{Hardware - Dasan V5812G GPON OLT:enterprises.6296.101.23.3.1.1.16.[{#SNMPINDEX}].last()}<-35 and {Hardware - Dasan V5812G GPON OLT:enterprises.6296.101.23.3.1.1.2.[{#SNMPINDEX}].last()}=2

Works if the subscriber device connected to OLT and signal <-35. Everything would be fine, BUT when you turn on the subscriber. device on the OLT, the signal value is first determined by -40, and after a few minutes it determines the real signal value. Naturally, the trigger works and sends an alert about the problem and immediately writes that the problem is gone.
Question: How can I change this trigger so that it fires, for example, 10 seconds after a problem is detected?