1级                       0分钟                     0小时 
2级                       30分钟                  0.5小时                           
3级                       90分钟                  1.5小时                           
4级                      270分钟                  4.5小时                           
5级                      810分钟                 13.5小时                             
6级                     2430分钟                 40.5小时                           
7级                     7290分钟                121.5小时                           
8级                    21870分钟                364.5小时                           
9级                    65610分钟               1093.5小时                           
10级                  196830分钟               3280.5小时                         
11级                  590490分钟               9841.5小时                           
12级                 1771470分钟              29524.5小时                         
13级                 5314410分钟              88573.5小时                             
14级                15943230分钟             265720.5小时                       
15级                47829690分钟             797161.5小时                       
16级               143489070分钟            2391484.5小时                       
17级               430467210分钟            7174453.5小时                       
18级              1291401630分钟           21523360.5小时                       
19级               3874204890分钟          64570081.5小时                     
20级              11622614670分钟         193710244.5小时