In a corporate environment, a network administrator is tasked with managing a fleet of VoIP devices across multiple locations. The administrator needs to ensure that all devices are updated with the latest firmware to enhance security and functionality. The devices are configured to check for updates every 24 hours. If a device fails to update after three consecutive attempts, it will be marked as \"inactive\" and will require manual intervention to restore functionality. If the administrator wants to ensure that at least 90% of the devices are updated within a week, how many devices must successfully update each day, assuming there are 100 devices in total?