Interesting that the devices are still timing out...
I don't recommend setting the timeout to 24 hours, as this could potentially consume a lot of system resources if you have many devices coming and going from the network.
Several factors could be at play.
- Client isn't configured in power save mode. Make sure it is PSP mode. PSP mode clients inform the WLAN that they will be sleeping.
- Smart-rf is making changes to channel/power and is not aware of sleeping clients.
- Smart off channel scanning is taking too long and/or is not client aware.