iExpenses Update section expiration dates?

 All-

I wanted to inquire on if anyone knew if there was an expiration date for any expense reports listed in iExpenses in the Update Expense Report section? I had someone ask me if they start an expense report..."how long will it stay in the Update section?" "Will it automatically delete after 30 days?" Etc. I would think that any expense reports listed in this section would remain indefinitely. But, would someone please confirm?

Thank you,
Erik