I am trying to find phrase or word which would properly cover following statement:
You can bring back the book tomorrow if you like, and if not it is fine.
I am trying to find a way to same that some action is optional, and if not done it will not have repercussions including hurt feelings. Hope my question makes sense.
Edit: a better explanation is that I am looking for a word similar to optional but implying it must be done in the future; that it can be procrastinated.