Setting up ongoing payment cycle for protected content?

Hello there,

Great work on the site and your plugins! We would like to set up an ongoing recurring payment cycle for the Protected Content plugin but it seems as if we do have to specify number of months, years etc..

Is there a way to set this up so it only cancels if the user stops the recurring payment (in other words a never ending payment cycle) or do we have to put a number there, for example 10 years or so?

Many thanks guys