According to a recent report on PWInsider.com, with the move by WWE to combine both RAW and SmackDown brands for all PPVs moving forward, the company is also lengthening the duration of the PPVs to accommodate the extra talent that will be wrestling at the events.
The report also adds that WWE has apparently reached out to its international broadcast partners to inform them that starting next month with Money in the Bank, the start time for each event will be 7PM ET / 4PM PT, with the Kickoff Show starting an hour earlier. The run time for the PPVs will also be at least four hours while the more important shows like WrestleMania and SummerSlam will obviously run longer.
Source: PWInsider.com