There is potential for downtime during a platform transfer. For a normal website, you could expect a maximum of 30 minutes downtime, but they're usually completed much faster than that. For a much larger website, it may take a bit longer. A platform transfer shouldn't take hours, so if you've been waiting longer than 30 minutes feel free to let us know. The status of the transfer will update as it progresses from Queued -> Platform Transfer In Progress -> Complete.