apache - How to properly increase PHP script execution time

I have a problem with execution time of php script as said above.

Script turning on from web browser. It's heavy, so it's execution time can take up to 5 minutes or even more.

What i've done already:

1. set_time_limit(0); - doesnt help
2. changed max_execution_time in php.ini - no effect
3. changed Timeout in apache - no effect
4. ignore_user_abort(true) - doesn't help

All variables were set to 1 hour, and still i getting disconect in 2 minutes. Browser said something like "Data is not obtained". I know that i'm missing something, but don't know what.

Thanks in any advance.