Nah, you can't put limits on the holiday days!! We're given 30 days a year, and if someone uses them all in one go then thats their problem. There could be a good reason for it, illness, a hospital stay etc..
I know it affects others but it goes with the membership, and we might be glad of it one day. Of course a note to our opponents to explain why we'd used that much holiday time would be polite, but not a necessity.
I've not used any holiday days yet, and I can't forsee me using any this year. But if I had to use all 30 in one go it would be for a dire emergency!