It really depends on the camera configuration per vehicle. Example: With skEYEvue, a (4) camera configuration can hold up to 350 – 400 hours of loop recording surveillance on a 1-terabyte hard drive. If there are more than 4 cameras, then it will take up more space, which reduces the hours of storage. On the other hand, if there are less than (4) cameras, then more hours of footage can be stored. *We also offer upgradable storage options for more space, if needed.