person2 (referred by their number) have talked in total ?
                  
                  
                  
                  
                  
                  in the for loop (calls)
                  
                  
                  (before create t_durations (empty dict) outside the loop)
                  
                  
                  
                  
                  
                  communication = line[0]+'#'+line[1]
                  
                  
                  t_durations[com] = t_durations.get(com, 0) + int(line[3])
                  
                  
                  
                  
                  
                  Now find a way to sum up coms duration
                  
                  
                  ex
                  
                  
                  '3333#4444':55
                  
                  
                  '4444#3333':22
                  
                  
                  
                  
                  
                  So duration between 3333 and 4444 => 77
                  
                  
                
Oh
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