I have used 1 key on level 12 and 4 on 14. Around 300 runs total and only have gotten 4 5* colourless Awakening shards. I don't think I can get 25 on 750 runs, most likely on 1800 runs.
60 runs per key a total of 30 keys.
360 ironite per key, 10800 to awaken one character.
It will take years for Awakening all the characters they are planning to release, unless they really increase the drop rate for those materials as they mentioned.
For the moment on hold and will not waste any more keys and ironite.