Firstly, not all classical pieces last 20 minutes. Classical works are an expression of the composer and at times, and coupled with the different movements, a certain amount of time is needed for performance. Some composers write relatively short works, too.
About 20 minutes.
three 20-min. periods
0 hours are in 20 min an hour is 60 min
two 20 min. periods
the auto bots defend earth and beat the decepticons (finaly)
It takes about 15 to 20 min. It takes about 15 to 20 min. It takes about 15 to 20 min. It takes about 15 to 20 min.
1h = 60 min so 1h and 20 min = 60 + 20 = 80 min
2 hours 55 min
10:05 --> 10 * 60 min + 5 min = 605 min 08:20 --> 8 * 60 min + 20 min = 500 min 605 min - 500 min = 105 min (= 1 3/4 hr)
Stride lasts about 20 min longer than any other sugarless gum and about 40 min longer than any sugar gum
1218 = 1200 + 18. (1200 min)/(60 min/hr) = 20 hr, so 1200 min = 20 hr, then add the 18 minutes, so 20 hr, 18 min or 20:18
middle school and high school are both 4 8 min quarters, college is 2 20 min half, and the NBA is 4 12 min quarters