[PHP] an error "Maximum execution time of 30 seconds exceeded in C:\...

[nyon]

   Hi,

I got an error "Maximum execution time of 30 seconds exceeded in C:\... on line 224" 
while
accessing a PHP page tie to a Mysql database.

1. Is 30 seconds the normal setting before it times out ?
2. Is this error is due to PHP or Mysql ?
3. How to I set it to 60 seconds ?

Thanks
Nyon