Chances are slim to nil that the recipient will log a date in his diary as a reminder when the restriction lapses. There is a tide in these transactions. If the tide passes, the recipient is on to the next opportunity. He never looks back. Remember what I said about the fickleness of technology.
Confidential information has a very short half-life.
Within a year or so, most of it will become stale and irrelevant anyway. It may even enter the public domain. That s why I feel that if the confidentiality obligations survive for a year or so, that s as good as eternity. Whatever the term of the non-disclosure agreement may be, make sure that it survives any agreement that follows it. Let me explain what I mean.