Thanks for the feedback. Really was unsure about this myself. 10 seconds sounds like a long time. I did have some performance issues with the game which affected the stamina regeneration rate. I wonder if that could also be part of it? Anyway, thanks again for playing and taking the time to try it out. Very much a confirmation that I needed to revise how that works.
Edit: Confirmed that the stamina regeneration rate is bugged. You should be waiting a couple of seconds (generally) at most for full recovery. Will get this fixed.