Operating time of a script
 

1.8.7
Technical support writes.
If the script borrows less than 10 % of processor time - it can work infinitely. If process loads processors of a server during 30 Sec. On 10 %, process correctly comes to the end, if process loads processors of a server during 5Sec. On 60 %, process correctly comes to the end.

As it is possible to bring restrictions in work of a script?

If you want to limit the index, check out the options described in Section 6 of the documentation.