If you aren't 100 shot or higher you shouldn't bother with a Direct Port system.

Personally I wouldn't shot something as small as 35. Seems like a waste of nitrous to me.

Most nitrous setups have a switch mounted on the throttle body that when you go WOT the nitrous begins to spray. Anytime you are not at WOT the solonoids remain closed and so you aren't sparying.

The added power lasts as long as your nitrous kit is armed and sparing. If you mean how long the bottle lasts well then depends how much you run it. But I can safely kill a bottle in a weekend, sometimes a long Friday night .

My Car is a 1992 Accord LX 5-Speed. I have an F22B1 engine, Header (Wraped), Resonator Cat, 2.5" Mandrel bent exhaust with one resonator, Canaster muffler, Short Ram Intake (Foam Filter), Walbro intank 255 lph fuel pump, Zex Dry Nitrous kit 75 shot, Zex Spark Plugs, MSD 8.5mm wires, AEM Tru-Tyme Cam Gear, Chipped ECU, and that's about it on the engine side. If I left something out it's minor anyway.

Dry kits are fine, Wet are better. If you can afford the wet and have someone in your area that can tune it for you I would spend the extra money on it.