Number of Niche Cable Networks Measured: Niche Cable Viewers Spend Nearly 7x More Time Watching Than They Did 10 Years Ago While the number of measured niche cable networks more than doubled over the last 10 years (driving up total time spent viewing), the time spent increased by nearly 7x, demonstrating the vibrancy of the content Number of Niche Cable Networks Measured: 21 51 Source: Nielsen Npower R&F Time Period Report, Persons 2+, Playback Time Period: Live +7 Days (+168 hours) | TV | Linear with VOD, Measurement Interval: 7/1/07-7/31/07 vs. 7/1/17-7/31/17. Network set reflects the identified 2017 niche cable networks, however not all were measured in the 2007 time period.