So, I get the question, but I don't think this is a great example of it.
In effect, I think that in the field, this particular restriction wouldn't often get tracked in tedious detail - it'd fall to the GM saying, "Hm, has it been two and a half years yet?" And if you track time strictly, many campaigns (like, most of WotC's published adventures) take less than that in game-time, so it becomes "once per campaign" which isn't all that hard to track. It then becomes a pretty simple rate limit. Heck, at that point I'd probably just replace it with a one-use item for the players to find.
But, to address the underlying question - making players do unfun things is not a suitable balance. If the restriction is entertaining for the player, that's fine. If the restriction is tedium for the player, I'm likely to replace it.