This depends on the below variables: Number of cameras Resolution of cameras-this is fully customisable so each camera can be set to different quality levels. Duration of ignition on-the cameras record continuously when the ignition is on so if the vehicles are on for 10 hours a day you will have less historic footage than in a vehicle that is on for 5 hours a day. We have a number of different memory options so please speak to our sales team and they can customise a solution for your fleet.