That's the reason for an option.
First of all we know how to use Event Hours.
Sometimes we start at 16:00 with a rebroadcasting by 10 minutes (CNN, BBC, Whatever).
Then an ID Station and commercials.
One music track or two,
Followed by a program which has 55 minutes.
It is obviously that we have to merge 16 and 17 hour.
That means that we must uncheck 17 hour in Event.
It is unproductive to check all the time hours. And sometimes we forget to do that.
That's why an option to alert us will be great: