How does the stamina store work on Flick Kick Football Legends?

How does the stamina store work on Flick Kick Football Legends? - Dedicated teenage boys in activewear playing football together on field of outdoor stadium on sunny summer day

Before purchasing stamina on the stamina store I have some questions:

How long stamina reserves last (both "greater" and "maximum")?
Can I buy both?
When buying stamina refills it says "Regain some stamina". How much is "some"?

Stamina

football-legends

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How does the stamina store work on Flick Kick Football Legends? - Young sportsmen playing football on outdoor field

How does the stamina store work on Flick Kick Football Legends? - Back view unrecognizable African American football player kicking ball on outdoor grassy field during match on summer day

How does the stamina store work on Flick Kick Football Legends? - Grayscale Photo of a Restaurant

Flick Kick Football Legends - Gameplay Part 1 (Android,iOS)

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Omar Ramadan, Omar Ramadan, Omar Ramadan, Bryce Carithers