Flickr has the upload limit for a video file i.e 1GB. So make sure your videos are smaller in size. This 'Uploadr Processing taking a while' issue is come up when working on a video. 1 video can be like uploading hundreds of photos at once. Once you have uploaded the videos on Flickr, they need to be optimized for viewing, which factors into the "Processing time". Don't be afraid if it takes 30 minutes to an hour per video.
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... an excellent job of uploading more then 300GB of photos to 2 different services