In app purchases and trial runs?

Question

I am building an app for a client that will have 30 days of content for free, thereafter you are required to buy a subscription via in app store purchases.

However,

Answer 1

There are plenty of free apps which provide limited functionality. They don't provide time limits though (or at least they shouldn't). I'm guessing it won't be as clear cut as accept or reject for Apple, because I did encounter an app which closes itself after 10 minutes, opening a web page to purchase it (closing an app is also against the Apple Human Interface Guidelines, as an app should never terminate itself).