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?