Trying to get condition correct on this automation, is there a better way to do it?

Configuration
1

I’d like the automation to trigger telling me there’s temperature sensor data coming from that sensor after it being “unknown”, but only if its been “unknown” for at least 5 minutes beforehand. The way ive got it setup now if the sensor cuts out and comes right back on 30 seconds later (the next teleperiod in tasmota) I get an alert. I created the condition of the sensor being unavailable for 5 minutes to attempt to slow the trigger down, I think.

alias: BIG freezer temperature sensor is no longer malfunctioning
description: ''
trigger:
  - platform: state
    entity_id: sensor.tasmota_nodetemp2_am2301_temperature
    from: unknown
    for:
      hours: 0
      minutes: 0
      seconds: 0
condition:
  - condition: state
    entity_id: sensor.tasmota_nodetemp2_am2301_temperature
    state: unknown
    for:
      hours: 0
      minutes: 5
      seconds: 0
action:
  - device_id: (removed)
    domain: mobile_app
    type: notify
    message: BIG freezer temperature sensor is no longer malfunctioning
mode: single