I believe it is 8 24 hours, rolling. So if you downloaded 5 items at 03:00, and 3 at 08:00, then at 03:01 the next day, you should be able to download 5 more items. If you run into any issues with it or want some assistance in doing some large-scale downloading (i.e. an entire series), you can e-mail me or dm me on Discord @ Orange Pekoe#0863. Orr you can let us know by posting back here again!