Reminder: if you install and log into the main SwagBucks app, they’ll send you an alert on your mobile phone every time a new code is released with a direct link to where you can find the code. This is also the app you need to redeem app-only codes.
http://www.swagbucks.com/mobile
I think on extravaganza days the release the codes every two hours between 10am EST and 6pm or 8pm EST. So, with 6 codes, they will be released at 10am, 12pm, 2pm, 4pm, 6pm, and 8pm. Either way, they are always released at or a few minutes after the start of an hour.