fuel tank reserve ? ?

[Piet82]

Hi. On a KLR650 '08. What safe distance would be reached on the reserve ?
Obvious one wouldent run it dry but just to know how "big" is the reserve ?
Thanks.

 

[lecap]

 

[Piet]

 

[diets]

 

[Piet82]

 

[Derik]

 

[meteldog]