You can do a batch upload that reduces the time somewhat. After you upload/submit the first pic to your gallery, and it takes you to the gallery where you can name the pic and set keywords, just click the 'upload photos' link on the top right side again instead of Process Files at the bottom of the page. Keep doing that til you have all your pics through the first stage and then do click Process Files to do that step all at once. Saves a bit of time.
I usually upload everything to the gallery first, then have a separate window open to my gallery and one for the post I am writing - easier to jump back and forth between windows to grab the url's than to do back and forth from gallery to the post.