Longer timeout before showing as unresponsive

[Rubeast]

Hello, I would first like to say that I really love the product and I think it is an essential addition to zigbee2mqtt.
Because I like using it, I have a small feature request.

As show in this picture, the IKEA repeaters are quickly shown as unresponsive.

However, according to this information they only send a payload every 4 hours.
https://www.zigbee2mqtt.io/devices/E1746.html

It would be great if they would only be show as unresponsive after 4 hours.