Is there a standard limp to erect proportion?

[daddy4use69]

This is not my cock, but in cruising around, I saw this and wondered if it's this long limp, how much bigger can it get? I know for me, I go from very small looking to a decent 6 inches, but others have different experiences.

 

[Gusbreggus]

This changes from person to person. Some don't change at all and some, like me, grow twice as big or more.