Duration

2 h

6 h

12 h

24 h

Mean

29.6983607

36.59

43.3305085

48.3409836

Standard deviation

10.6580563

12.7690662

13.7554786

14.7781976

b

8.31426738

9.96104988

10.7305426

11.5283578

a

24.8993655

30.840482

37.1368393

41.6868155