DHCP Retries

I'm away from home at the moment so don't have physical access. The UPS that powers my router died. I've managed to get the router back up with the help of a neighbour but the C8 is still down. It has either hung or has assigned itself an apipa ip address. I read somewhere something about dhcp retries. Is this something that is automatically enabled on the hub and if so what are the retry intervals. I don't want to bother my neighbour again if it might sort itself out.
I guess for the future I'll need to assign static IP and get a wifi socket for the hub for remote power cycles. Hindsight is a great thing!

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