I bought a tub of HD wax before I started paying a bit more attention to detailing.
I find that it will give a decent shine, I do remove it with the addition of a quick detailer to constantly lubricate the microfibre.
I haven't washed my car in around 3 weeks (extremely unusual for me) and I noticed a very good beading on the car yesterday. I wouldn't think it would last for 6 months in my opinion, however conditions in Scotland can be particularly wearing on any paint protection.
I will say one thing though it is a pain in the backside to work with and I won't buy another tub id be looking at a better quality product for the next time.