How to set script time limit in shell?

[GoodWill]

Hello,
I am trying to set script timeout in shell, because there is zero time limit by default in shell and the script never times out. I set set_time_limit(3); and also ini_set("max_execution_time", "3"); but nothing works. Is there any other way how to set max execution time or to set it properly?

[Weedpacket]

As noted in the manual,

Note: These directives cannot be initialized with another value from the configuration file php.ini or a custom one (if specified). This is a limitation because those default values are applied after all configuration files have been parsed. However, their value can be changed during runtime (which does not make sense for all of those directives, e.g. register_argc_argv).

Hence, ini_set('max_execution_time','3');