I have sent link for listing at DMOZ now it s 4 months past still not listed at there what shall i do for this .
Had you thought of reading the sticky Dmoz 101: Background on the Open Directory Project? The answer to your question is within ... and more .
There is go "generally" when you are talking the time it takes for approval. Though the rest of your statement is about as accurate as it can get... but honestly you could change MONTHS to Hours, Days, or even Years and still be as accurate. Officially it's "it may take several weeks or more before your submission is reviewed" and even then, thats REVIEWED not approved. If you are seeking approval, then officially it ranges from maybe to never.
How do you then explain all those site that have not been listed 12 months after they were first suggested?