Are you referring to a machine correction or hand job (snigger)? Depending on miles covered, I can see there only being a need for a yearly machine polish at best, unless you drive a fair few miles at speed etc and on dirty roads. I've covered 3k miles since I clayed my car in November and after a clean, the paintwork still feels glassy and no sandy texture at all.
I have to agree. I wax monthly to keep the protection up. It is needed to ensure the best paint quality. As for "correction" if you need to do this more than once a year, I would suggest you re-think your washing technique as once a year is sometimes overkill.
Just to clarify, correction is using a mechine polisher, that's rotary or da.
Take a look at www.detailingworld.com for more info. Most detailers are on their.