...and posting all that shite into one gallery instead of five chodes was clearly forbidden by the Allah Himself, it seems...
Limit of images per gallery is 2000, OP, not however will fit into 500 MB. Size limit is 10000 MB, by the by - not 500 MB either. You can upload thouse batches in several sessions in ONE gallery.
>Max 2,000 files and 10 GB per gallery. Do not upload more than 500MB at a time, less if you have a slow connection.