Spotted this while going through the advanced tutorial with @codey (because why not).
On the undelete step, Codey first explains that deletes aren’t immediate and the post will only be removed after some time. So I undeleted it, Codey then told me I only have 0 hour(s) to undelete a post. 
Apparently I beat a zero-hour deadline. Screenshot attached.
My guess is the message pulls that number from the forum’s setting for how long deleted posts are kept, and it’s set to 0 here. Nothing is broken, it just reads a bit funny right after the “deletes aren’t immediate” line. Tweaking the number or dropping that sentence from the tutorial would sort it.
Otherwise the tutorial was fun, thanks to whoever put it together!
