Singhsaab said:
Once someone send Citizen application, after what approx time they revert back.
How can I check if my application has been received?
If you mailed your application to CIC, you may wish to use a courier service that requires a signature when delivered, gives you a delivery confirmation and/or allows you to track your package. Please note that there may be a delay between the date CIC physically receives your application and the date it is opened. CIC cannot confirm that your application package has been received until it has been opened in our offices.
If you applied at a Visa Application Centre, CIC cannot confirm that your application package has been received until it has been opened in our offices.
If you applied online, you will see a confirmation page after you submit your application. You will also receive an email asking you to check your MyCIC account. A confirmation message with a confirmation number will be in your MyCIC account. Keep your confirmation number for your records. Please note that it may take a few hours for you to receive an email from CIC after you’ve submitted your application.
http://www.cic.gc.ca/english/helpcentre/answer.asp?q=028&t=4