My stay validity ?

[Joeshu]

At Poe there r new machines for passport scan.in that form I declare my stay of 15 days. Immigration officer stamps on my passport and did not ask anything.
My question is
Till how long is my stay valid for ?
15 days or
6 months

 

[zardoz]

At Poe there r new machines for passport scan.in that form I declare my stay of 15 days. Immigration officer stamps on my passport and did not ask anything.
My question is
Till how long is my stay valid for ?
15 days or
6 months

If not otherwise marked on the passport or issued a Visitor Record, it's 6 months.

 

[Joeshu]

There was a print from the machine with my photo on it.what was that for.