Trite as it sounds, to me, it is the principle involved, and this really has nothing to do with adjudication. ICCF and ICC have adjudications and the rules are clear. Time for the tournament has elapsed (around 2 years in correspondence, 20 minutes a round in blitz, etc.) or a game has been abandoned. Also at ICC I just play blitz, noescape, vacation and abandonment are never issues. I admit I should not have cited ICC as it is irrelevant to the present discussion.
My point is the vagueness of the policy here and the walkarounds I've been hearing, most admittedly by members rather than staff. On the other hand, the staff does seem to respond to the vocal members thus the original implementation of the policy. Vacation belongs to the player to use as they wish. As the FAQ says, its for when I need a break (see earlier thread). If my opponent wants to play with move allowances and vacation time hoping I'll drop dead while one move from mate, so be it. The vacation is the player's whether as part of his free membership or if he paid for it. What's next, "My opponent uses all 3 days for his move when I'm winning"? The horror!
If, as Erik says, the policy has very rarely been invoked, why was it even necessary? To invoke the policy, two adjudications have been made, vacation was abused, and the game is lost. My point is, vacation can't be abused and a game is not lost if you lack material to win, or your opponent has overwhelming material or whatever. Opponents make mistakes, nonwinnable games can be drawn, etc.
If the length of vacations is a problem, reduce vacation time across the board (for a site solution), play no vacation tournament/games (for individual solution). As a final thought, how do you know the vacation is not being used for legitimate reasons? If I say I am on vacation. I have valid reasons. How can that be challenged?
BTW, the current vacation is the first I've taken in a couple years, I started it with 2 months, 29 days on the books, and although I've had games drag and many a win on time I've never called for an adjudicaiton.

Its actually pretty funny that one complains of adjudications here and then mentions ICC, as if they dont have them there. I have been a member of ICC since 1996 and they have always had adjudications there..... they even adjudicate blitz/bullet games ! <GASP>