Duration class

1. Constructors
2. Duration
3. Properties
4. hashCode
5. inDays
6. inHours
7. inMicroseconds
8. inMilliseconds
9. inMinutes
10. inSeconds
11. isNegative
12. runtimeType
13. Methods
14. abs
15. compareTo
16. toString
17. noSuchMethod
18. Operators
19. operator *
20. operator +
21. operator -
22. operator <
23. operator <=
24. operator ==
25. operator >
26. operator >=
27. operator unary-
28. operator ~/
29. Constants
30. HOURS_PER_DAY
31. hoursPerDay
32. MICROSECONDS_PER_DAY
33. MICROSECONDS_PER_HOUR
34. MICROSECONDS_PER_MILLISECOND
35. MICROSECONDS_PER_MINUTE
36. MICROSECONDS_PER_SECOND
37. microsecondsPerDay
38. microsecondsPerHour
39. microsecondsPerMillisecond
40. microsecondsPerMinute
41. microsecondsPerSecond
42. MILLISECONDS_PER_DAY
43. MILLISECONDS_PER_HOUR
44. MILLISECONDS_PER_MINUTE
45. MILLISECONDS_PER_SECOND
46. millisecondsPerDay
47. millisecondsPerHour
48. millisecondsPerMinute
49. millisecondsPerSecond
50. MINUTES_PER_DAY
51. MINUTES_PER_HOUR
52. minutesPerDay
53. minutesPerHour
54. SECONDS_PER_DAY
55. SECONDS_PER_HOUR
56. SECONDS_PER_MINUTE
57. secondsPerDay
58. secondsPerHour
59. secondsPerMinute
60. ZERO
61. zero