I've heard alot of great things about the Meguairs Ultimate Quik Wax. I also love that Target often has it on sale for about $7. Too bad I didn't get any at the time.
Regardless, I also recommend Armor All Extreme Shield Wax. After you develop a technique, it'll only add about 10 minutes to your washing time. I just wet the paint with it, by smearing it all over my hand then dab it on the paint. You don't need full coverage since you don't need to wait for it to dry. You immediately wipe off. During that wipe your microfiber cloth will smear it for full coverage.
Since your car is newly polished it's longevity, with my experience, for daily drivers is 6 months. Daily drivers that are garaged and are parked in parking structures can last 1 year. Since you'll probably apply it every other wash, your paint will have a sacrificial barrier at all times. Even if that barrier gets removed, you still have your wax underneath.
The negatives, despite it being hydrophobic it doesn't leave a slick surface. But who actually buys a car to feel it up constantly?
The other negative is longevity is determined by your preprep. I never used it on top of another wax, but on top of well prepped polished paint, it lasts as much as I mentioned previously.