Now we encounter two difficulties.First,it is hard for us to determine how long the duration will be; second,in respect of the abnormal time duration which also may rarely make a correct determination.
There will be two problems of handling the case. One is impossible to know how long it will last, the other is difficult to confirm the unusual period of the time.
We met two major difficulties during handling of this problem, one is that we don't know how long it lasts, second is that it's hard to tell while it is in different period of times.