The OpenWRT guest wifi guide isn't a simple switch like you would get on your OEM router, but involves manually setting up a bridge device, a new firewall zone, and a new AP on one of your radios.

This can take some time if you want to do things the right way. 10 minutes to setup with no extra config steps. Add another 10 if you need to move around your firewall rules, and another 20 for random debugging.

https://openwrt.org/docs/guide-user/network/wifi/guestwifi/configuration_webinterface

Although, you set it up once. After that it's just a checkbox.

[–] nibbler@discuss.tchncs.de 24 points 3 days ago (1 children)

and of course you need to tag the new network on all your switches, routers, APs... not to forget testing and integration in your monitoring system. 45 minutes is absolutely fine.

[–] tetris11@feddit.uk 4 points 2 days ago

Oh true , hadn't thought about that - I just assumed it was a single device