From linking a device to your account to adding channels, find Roku setup troubleshooting help and activation support from our community support forum.
I don't think it should take all that long, maybe a few minutes. If you are talking about resetting a Roku TV (Roku branded, or just another brand running Roku software?) it should just reboot itself and ask for setup info, as if it was new out-of-the-box. Not all that different than a stand-alone device.
