Ordering events in a table

I have the following table of rainfall events separated by NaN.

       Date        Time (Hours)    NumOfHours    Total Rainfall(mm)
    ___________    ____________    __________    __________________
      
     
            NaT           NaN         NaN                  6       
    06-Apr-2019      09:00:00           1               1.02       
    06-Apr-2019      10:00:00           2               0.51       
    06-Apr-2019      11:00:00           3               0.25       
            NaT           NaN         NaN                  7       
    17-Apr-2019      03:00:00           1               0.51       
    17-Apr-2019      04:00:00           2                  0       
    17-Apr-2019      05:00:00           3                  0       
    17-Apr-2019      06:00:00           4               0.25       
    17-Apr-2019      07:00:00           5               0.25       
            NaT           NaN         NaN                  8       
    29-Apr-2019      08:00:00           1               0.76       
    29-Apr-2019      09:00:00           2               0.25       
            NaT           NaN         NaN                  9       
    02-May-2019      22:00:00           1                3.3       
    02-May-2019      23:00:00           2                  0       
    03-May-2019      00:00:00           3                  0       
    03-May-2019      01:00:00           4               0.25   
             NaT           NaN         NaN                10       
    03-May-2019      16:00:00           1               1.02       
    03-May-2019      17:00:00           2               0.51       
            NaT           NaN         NaN                 11       
    05-May-2019      06:00:00           1               0.76       
            NaT           NaN         NaN                 12       
    13-May-2019      16:00:00           1               1.52  
    

I would like to order the events based on the total number of hours in numerical order (and subsequently chronologinal order based on the date). So it looks like:

       Date        Time (Hours)    NumOfHours    Total Rainfall(mm)
    ___________    ____________    __________    __________________
            NaT           NaN         NaN                 11       
    05-May-2019      06:00:00           1               0.76       
            NaT           NaN         NaN                 12       
    13-May-2019      16:00:00           1               1.52
            NaT           NaN         NaN                 10       
    03-May-2019      16:00:00           1               1.02       
    03-May-2019      17:00:00           2               0.51 
            NaT           NaN         NaN                  8       
    29-Apr-2019      08:00:00           1               0.76       
    29-Apr-2019      09:00:00           2               0.25 
            NaT           NaN         NaN                  6       
    06-Apr-2019      09:00:00           1               1.02       
    06-Apr-2019      10:00:00           2               0.51       
    06-Apr-2019      11:00:00           3               0.25 
            NaT           NaN         NaN                  9       
    02-May-2019      22:00:00           1                3.3       
    02-May-2019      23:00:00           2                  0       
    03-May-2019      00:00:00           3                  0       
    03-May-2019      01:00:00           4               0.25
            NaT           NaN         NaN                  7       
    17-Apr-2019      03:00:00           1               0.51       
    17-Apr-2019      04:00:00           2                  0       
    17-Apr-2019      05:00:00           3                  0       
    17-Apr-2019      06:00:00           4               0.25       
    17-Apr-2019      07:00:00           5               0.25  
 
    
  

[Walter Roberson]

Is it possible to have two independent periods on the same day? If so are they to be treated separately?

Your 02-May-2019 has readings of 0 0 inside it, implying that the situation I ask about above has already been taken care of, that pauses inside any one day are present as 0 in the data?

I see there also an answer to another question I had, about what happens if the data spans more than one day; I see it just continues and should be treated as a continuation ?

[Queena Edwards]

Is it possible to have two independent periods on the same day? If so are they to be treated separately? Yes

Your 02-May-2019 has readings of 0 0 inside it, implying that the situation I ask about above has already been taken care of, that pauses inside any one day are present as 0 in the data? There aren't any pauses in the data. They look similar to what was posted where for an event between the NaN there can be 0 rainfall in between hours of rainfall

I see there also an answer to another question I had, about what happens if the data spans more than one day; I see it just continues and should be treated as a continuation ? Yes