What is the maximum time for delivering app binary to app-store? I had put all of my app information into itunes connect and I got an email saying it is ready for upload. Please upload app binary.

But, at the last time our client asks to change the designs of the project. I'm afraid how long the apple itunes connect will wait for upload.

I like to know,

What is the maximum time allowed by apple for delivering app binary to app-store?

is there any warning or mails will be sent to me from apple-inc about this?
You have nearly 6 months(180 days) time to upload the binary.

As per Apple developer documentation,


  150 Day Warning. You will receive an email when you have had an app created for 150 days but have not yet delivered a binary,
  reminding you that you have 30 more days to deliver your binary or
  your app will be deleted from iTunes Connect. You will be given an
  exact date of your deadline in this email.
  
  173 Day Warning. You will receive an email when you have had an app created for 173 days but have not yet delivered a binary,
  reminding you that you have 7 more days to deliver your binary or your
  app will be deleted from iTunes Connect. You will be given an exact
  date of your deadline in this email.
  
  180 Day Deletion Confirmation. You will receive an email confirming that your app has been deleted from iTunes Connect, if you
  have not delivered a binary before your 180-day deadline.