Hi, Ioannis

Some more info are necessary ...

- box placed in an open place ??? ( rain or snow can cover it ???)
- box vertical or Horizontal ( I or __ )
- put on a shelf ???
- is there "wind" around ( forced convection ? )

not so simple a Thermal convection problem ...

Alain

PS: Title is a French Humorist ( Fernand Reynaud ) Well known BIG success of the 70's ...