Create a delay between FTP tasks, or?

Hi,

I have a package that will be using an FTP task to send a file (file1) to an ftp site.

Once the file (file1) is received at the ftp site, a corresponding file (file2) will be placed in the ftp directory, and then I will need to ftp the corresponding file (file2) back.

However, there will be a time delay between the time that file1 is received and file2 is put in the ftp directory. Maybe 5 to 30 minutes.

What is the best way to handle this scenario? I want to ftp file2 back as soon as it's available. However, I don't know when that is, and so I was wondering if there is a way to dynamically check for the availability of the file, so that I don't have to "hard code" a wait time into my process.

Thanks!