CPU load once in a minute - cron

Hi, I use FreePBX 13 version with asterisk 13. I noticed that once in a minute there is a CPU load. Then I checked “/var/spool/cron/asterisk” rules and detected that there is one line :

“* * * * * [ -x /var/lib/asterisk/bin/schedtc.php ] && /var/lib/asterisk/bin/schedtc.php”

That file isn’t commented so I can’t understand what this script actually does. I’m interested in if I change ‘once in a minute’ rule to ‘once in an hour’ what can occur to system performance? I need to know what that file is for.

The script is used to update the LED of BLF buttons programmed with Time Conditions.

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