Integration

I have a BPEL process (Main Process) which call an Async BPEL process daily. The main process will initiate a Async BPLE instance once a day using while loop in it. Everything is fine if the Async BPEL execute successfully and able to do a call back to the Main process. The problem come in when the Async BPEL process failed to do a call back to the main process. The main process will stay there and wait for the response from the Async BPEL. In this case, the main process will wait forever which I dont want it to wait. I want it to skip it, and initicate a new process for the next day.
Is there any ways that I can ge around this problem?
Is it possible that I could set a timeout from the main process which will stop waiting for the response from the Async BPEL process after a time period, and continue to initiate a new Async BPEL for the next day?

Please help,
Thanks