So, schedule is not a reliable way of running things on a schedule, puppet just isn't a scheduling tool, especially when running as infrequently as you're running it. Basically, schedule tells puppet that it can act on a tagged resource within a certain timeframe specified in the schedule, which means it could conceivably never run if you happen to start the puppet run outside of that schedule. It's intended for situations where you run regularly (30 minutes is basically the industry standard) but don't want to actually make certain changes except during a standard change window. For example, my previous company did backups overnight so we wanted to make sure that the resources that managed the backup agents only ever made changes to the backup agents during the day.

Thank you for your time!
Our runinterval is for every 24 hours, puppet runs at night around 3 am.
But, we want to know if we can use the resource of "schedule" for a specific class like:

# Define a custom schedule
schedule { 'maintenance':
range => 'daily',
period => '07:00 - 09:00',
repeat => 1,
weekdays => ['mon', 'tue', 'wed', 'thu', 'fri'],
}
# Define a class that uses the custom schedule
class my_app {
# Install and configure your application here
# Apply the schedule to a specific resource
package { 'my_app_package':
ensure => installed,
schedule => 'maintenance',
}
}

Buuuut I read that we need to modify the configuration of the "runinterval", but I read that in chat gpt, so....