Also as a addition to what Ayaya said, with the maintenance SCP they still breach quit often due to D-Class, other SCPs and E4 stopping maintenance from getting to the cell. they are also roll based and most of them are 50 or 60 so even if someone makes it to the CCs still about a 50 percent chance that they get stopped.
also making only 1 advert could make it to where at prime time it could be missed due to the folding chat or someone gets on after that one advert they know absolutely nothing about the SB but people still get mad because they didn't stop the SB. Also the 10 minutes would make it to where it would be un even increment for the SCP breach times as most of them are 15 min breach's