Understanding omission failure in distributed systems

Posted by karthik A on Stack Overflow See other posts from Stack Overflow or by karthik A
Published on 2012-09-01T15:36:18Z Indexed on 2012/09/01 15:37 UTC
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client-server

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distributed-computing

The following text says this which I'm not able to quite agree :

client C sends a request R to server S. The time taken by a communication link to transport R over the link is D. P is the maximum time needed by S to recieve , process and reply to R. If omission failure is assumed ; then if no reply to R is received within 2(D+P) , then C will never recieve a reply to R .

Why is the time here 2(D+P). As I understand shouldn't it be 2D+P ?

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