Should splitting tasks increase duration ?

Hi ,

As per the definition given for ’Duration ’. It is active time required to accomplish the task.

But suppose i know , that active time required is 10 days , and due to some reason i am splitting the task to initially 5 days active time , 20 days idle and then again 5 days active. I find after splitting the task the duartion changes itself to 30 days , even though i am active only for 10 days on job.

i want to be enlightened on this behaviour.

Thanks,

regards,

Vinod R