I was living in 2 realities at once. Akane says this during her explanation of her resonance with junpei in 999. This seemed strange as she seemed to merge with him instead of just taking the memories but junpei did not realize this happening all the while of 999. it was probably akane's doing. This probably means that maybe she could not just transport her consciousness through timelines, maybe she could also live in multiple realities at the same time and also be able to act in all of them. This would mean that she experiences every parallel universe and fate. this would also explain why the creator seemed to suggest that Akane was millions of years old in the VLR Q&A. if she could only jump like sigma and phi she would maybe experience about a 1000 years worth of time. However if she experiences every timeline then she would easily be experiencing millions of years of time. This is all just speculation though.