Wow thats a long key generation sequence! I apologize you experienced this, in my testing of hundreds if not thousands of key generation sequences I never saw any take more than about 3 minutes - there are various points at which it can fail (insufficient randomness, power interruption, etc) that can cause it to take longer, this may be a power issue since the CPU on the Oak runs at full 100% to do this, but now that it is a one time process so it should not come up again.