Twenty of anything is called a 'score'
Shay Given is 41 years old (birthdate: April 20, 1976).
The duration of Telemiracle is 20 hours.
Four hours and twenty minutes earlier in math can be calculated by subtracting the given time duration from the current time.
20 years.
20 years old
20+20
Patents generally last for 20 years from the first date of filing for priority. Patents filed prior to 1995 in the USA, however, may have a duration of 17 years from the date of ISSUE, or 20 years from filing, whichever is longer. Patents on medicine often obtain statutory extensions, under US law, for certain delays caused by FDA review. This can substantially increase the patent duration beyond 20 years.
Gunsmoke : The radio version ran from 1952 to 1961 and the TV series ran for 20 seasons from 1955 to 1975 .
This is no given duration for an F3 tornado. However, generally they are fairly long-lived, typically lasting 20 minutes or so.
The Alzheimer Disease Association claims that the time from the onset of clinical symptoms to death can range from three to 20 years, with an average duration of eight years.
Given good conditions I have known them live for 20 years.
Between 20 and 30 years if given good care.