1. As far as i know, opening hours are 11-4(am). Daily ticket hence covers full 17 hours.
2. Both. Some girls actively approach you (e.g. Coralia). Others do their walking tours through the Club. A sign with your hand or a smile from your side suffices. Or if you stroll through the club, they may call you ("Where do you go?"). If a girl just sits and waits, this may be a sign of overall passivity.
3. No, at GT no time with a girl is included. On the other hand, food is included as are non-alcoholic beverages.
4. Yes. If a pair of girls is on walking tour, they might even suggest it. Otherwise, if you see a girl you like you might or even should ask her with whom she would like to team up.
5. Smoking is allowed outdoors. Mobiles are officially not allowed. A discreet look on the screen once in a while should not be a problem. Put it on silent or vibration. I usually have mine in the pocket of my bathrobe as I listen to music. Taking photos is an absolute nono.
6. I have the impression that more men either come in groups or meet friends there.
7. You get your bathrobe and/or towels and are expected to be naked underneath. Hence, you step into the pool naked. Nobody cares whether or not you cover yourself with the towel when sunbathing in the garden. Just don't openly jerk off. It is uncommon for men, though, to walk around stark naked.
Hope this helps. Have fun,
Archie