What do you think about the current anima regeneration system?

For context, we currently get anima back at a rate of 1 anima for every 4 hours of real-life time. It would therefore take 16 and a half days to regenerate your anima supply from 0 to 100.

That seems rather prohibitive. I wonder if other options have been discussed, such as:

1. An accelerating system that increases the rate of anima regeneration based on the length of time anima is not used. For example, for the first 24 hours anima regenerates at a rate of 1 per 4 hours. If anima still hasn't been used, then the rate increases to 1 every 3 hours. After the next 24 hours, if anima still hasn't been used, it then regenerates at 1 anima every 2 hours, and finally after a further 24 hour period, at 1 anima every hour.

As soon as anima is used, this cycle is reset and the 4 hour period for 1 anima starts again. Under such a system, you would replenish anima from 0 to 100 in 6 days, assuming you never use anima over that period.

2. Abolishing anima entirely, and making teleportation a CNJ specific skill with a set cool-down period (say 15 or 20 minutes). General teleportation to crystals would still be dependent on first arriving at the crystal, and would be a spell learned at say level 20, while teleportation to specific cities/capitals would be their own specific spell learned at a later level, like 30 or 36.

Any other thoughts?