Set these in cpanel not through vBulletin cron/scheduled tasks as those are activity based and if no one coincidentally is on the site at the time it's supposed to shut off it won't run the cron to close the site.. well I suppose it would once they visited of course but would it be too late then i.e. would the processes you mentioned above already be ongoing and then issues arise etc. If you set up the cron in cpanel however it will run at the specified time when the server time matches.
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