My turn:
Personally, I would go for the whole "close @6am-6pm" but you have to realize that drugs will be anywhere and everywhere at anytime. Now, because Ibiza (or Eivissa, which I know it as) is a destination place that is known for massive clubs and all, it is something that you have to think about on both sides of the coin.
Personally, I would not have a club that is open from 6am till, whatever. Clubs do have to close down for a while to restock, keep count of inventory and money, and, give people a chance to recuperate, employees too. having a club open at 6am only brings like, drunks and all. I know this because there was this hole in the wall place in town that opened up at like, 7am serving liquor. Damn. I love a drink but that's WAY too early.
Drugs are going to be everywhere. That's just the way it is. I do want to know what time these arrests were made.
Shutting down the clubs all together will have the island in ruins. Not everyone who goes to these clubs are drunks or drug addicts. There are some people that do love the scene and the music.
I would like to hear what comes from all of this.
I do know that eventually, I would to travel there and I hope that by that time, the clubs will still be open.
Abominus