I said high not long, there is a difference, especially when this is only the second area.
I'm referring to the relation of stamina regeneration to consumption ratio.
Also, I doubt it will keep the same pace but instead decrease. I expect far larger sinks in the future.
There is a concept called difficulty flow in Game Design. A good game makes it a nice gentle upwards curve, matching risk and reward.
For the most part OI handles stamina well, far better than this does.
Plus I doubt many appreciate going two frames and then having to wait 2-3 hours to go another two when all that happened was really a perspective switch.