LP refers to the Long Play mode in several video formats including VHS, SuperVHS, Video 8 and Hi-8. Using LP mode, also often referred to as "4 hour" mode in NTSC countries, you can store twice the normal amount of video content on a standard tape. This is achieved by slowing down the linear velocity of the tape to 50% that of the normal (SP) mode. With VHS this means 11.69 millimeters per second in LP mode for PAL and SECAM systems and 16.67 mm/s for NTSC. As the capacity used to store the video content is practically halved, the image and audio resolution is lower and the quality of the recorded material also degrades faster, especially on the PAL/SECAM systems which already have lower linear velocities to start with.