Best time to max out Stamina (Available Ability)?

[IanTheWizard]

I just got the test results.

I used two new characters in Gipath for the test. One took Level 1 Stamina earlier; another took it later.

• For the "earlier" character, when his total Experience became 629, his Stamina became 49. I let him take Level 1 Stamina at that time. After that, when his total Experience became 1485, his Stamina became 76.
  
• For the "later" character, I let him take Level 1 Stamina when his total Experience became 1485. Right after taking it, his Stamina became 76, too.
  

So @Piter is right. It does not matter when you take the Stamina (Available Ability).

Thanks @Piter for the precious information and inspiring me to test!