You should manage at least an hour or two fortnightly.Heat and UW sun rays,your cam is bearing will ruin its beauty soon,so go to an autocare shop and buy just one wax like mother's or meguiar's spray wax,why spray wax? because its super easy to apply and wipe off,whole car can be covered with in just 15 minutes without hard buffing and without any residue on trims,nooks and corners.
I don't think a couple of hours would be any problem twice a month or is really it?