It's not that bad, but yeah, you don't get 100% of your curation reward until 30 minutes. You lose almost all of it at 0:01 , you keep almost all of it at 29:59, and the curator's portion increases slowly during that entire half-hour, but I don't know exactly what the curve looks like. I read a post a couple months ago by someone who actually went in and read the code, but I couldn't find it again last time I looked for it.