Klasse SG, if applied correctly and in two or three coats (at least 12 hours apart between coats), should last you many months. It lasts at least six months for me although I admit my truck is garage kept and always kept clean. But even in harsh conditions, a weekly application is way overkill. If I were you I would do it right the first time and then simply go on a good maintenance schedule until the next Klasse detail (as I said, in my case and for most people this is around twice a year).
The maintenance I perform is rather simple. When I park my truck I check and remove bug guts, bird bombs, tar, etc. I use Poorboys SW by the gallon! If it is a little dirty I go with QEW and if it is filthy I just get a shampoo. After each wash, be it by SW, QEW or shampoo, I use a QD to enhance and protect the SG lsp (except for SW, I do not use a QD for any kind of cleaning). One excellent product for this is Menzerna's HGAS. It is rather expensive and hard to find but it is very, very good. Since I have a lot of SG, I make a home brew using 1 part SG and 3 parts distilled water (not all that different than the Sonus Spritz). I put this mixture in a mister bottle or, better yet, a reuseable/refillable aerosol can and use it as a QD over a very clean surface (it is part SG afterall). This homebrew rejuvenates and enhances the shine and protection of the lsp SG. It is much, much easier to spray and wipe this once a week than to use the SG straight with an applicator pad. You will be happy with the results and have a lot more time to drink a beer while looking at your pretty your vehicle.