There are a lot of different Ceramic coatings on the market and with it a high variety in quality.
A high quality Ceramic Coat cost easily 2-3000 NOK for a small bottle.
Applying it correctly also takes a very long time. 3 days at least.
Day 1. Washing + polishing. Then dry overnight.
Day 2. Applying ceramic coat and then it needs to harden for 24 hours.
Day 3. Pick up car at end of day.
That is why it costs 10k+ NOK. With the top coatings you get 5 year warranty. So then you can go back if it already starts failing so quickly. 
Nothing lasts 5 years unfortunately. Fusso Synthetic Wax is a popular choice among hobby and experienced alike, and has a stated 12 month guarantee.
Fusso will be removed if you use certain types of degreaser, then it lasts only until that happenes.
Fusso will be harshly affected by snow and dirt from winter roads, that will massively effect wear.
Therefore, fusso in Norway does not have 12 months. It has 2-3 if you coat during summertime.
A 5 year ceramic coating of a good brand is good for about 1-2 years here in Norway.
There is no such thing as a 7 year coating