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If I'm using carnauba wax, I do it every other month. If I use a sealant I may go three months and then throw a coat of carnauba on top of it. I use either Mothers or McGuires. For the inside I use McGuires interior detailer - it doesn't streak, or leave any oily residue - and I do that every other week.
To me, it has a lot to do with how the car is stored when not in use. Mine is garaged most of the time and a once a year waxing works fine. I use Meguiar's clean and wax.
I just went through an 8 hours long process with the Chemical Guys products. Started with wash, clay bar, V36 then V38 then glaze then Jetseal and finally 50/50 wax. Used the griot DA and results are quite remarkable. No swirls anywhere anymore and paint is glossy and shining. Really pleased with the results but the work was quite demanding. I also used 3 steps process on the leather and 303 protectant on vinyl. Will now do this whole process once or twice a year depending on usage and wax/seal again every 3 month.