processing and answer time, between two gigabit ethernet devices connected to the same local area network switch fabric. 277.8 microseconds – a fourth (a 60th of a 60th of a second), used in astronomical calculations by al-Biruni and Roger Bacon in 1000 and 1267 AD, respectively. 489.67 microseconds – time for light at a 1550 nm frequency to travel 100 km in a singlemode fiber optic cable (where speed of light is approximately 200 million metres per second due to its index of refraction). The average human eye blink takes 350,000 microseconds (just over second). The average human finger snap takes 150,000 microseconds (just over second). A camera flash illuminates for 1,000 microseconds. Standard camera shutter speed opens the shutter for 4,000 microseconds or 4 milliseconds. 584542 years of microseconds fit in 64 bits: (2**64)/(1e6*60*60*24*365.25) See also International System of Units Jiffy (time) Orders of magnitude (time) Picosecond Millisecond References External links The National Institute of Standards and Technology (NIST) Orders of magnitude (time) de:Sekunde#Abgeleitete Maßeinheiten