For the record, the 1.5-hr limit reads like a recommendation, "as a courtesy to fellow flyers" or some such. I would hardly call it official. Who knows how it would be enforced if it all.
On a related note, this blog post was delighted to announce earlier this year that "...there's still no time limit on the cabanas, so once you grab one it's yours until your flight leaves." Was it really understood that you were entitled to camp out indefinitely?
http://www.ausbt.com.au/first-look-p...unge-hong-kong