No subscription is necessary. You will need an iPhone or iPod Touch and the ability to sync it to iTunes in order to get iPush installed. If using an iPhone, the application will work over the cell's data connection, but it isn't necessary. With either an iPhone or iPod touch utilize any Wi-Fi connection. (So a service contract is not necessary.)

In theory you could record until the file storage system was full. This length will vary depending on the iPod Touch or iPhone version and what is already installed or stored on the device.

If the audio is setup to automatically load into the automation system and the user had previously scheduled the item in the log, it should play at the scheduled time.

Yes, the latest version of iPush supports FTP transfers and makes it very easy to use. In the Settings page you can now choose FTP for the transfer instead of STS (Wancasting). So select that option and then enter FTP details for your FTP site and folder you wish to upload recordings to.

Importing from iPush is very easy. All you need to do is configure an Autoload folder, under Configuration | System, to point to the folder where the FTP uploads are arriving. Give it the appropriate settings and then restart the Autoload process under Launcher on the Startup Manager to activate it.