Hi TinyHammies98!
With all bedding, how often you should change your cage depends on how big the cage is and the type of cage it is. For example a very small Habitrail cage (which is far too small for ANY hamster) which is mostly plastic, would absolutely need to be changed on a weekly or bi-weekly basis unless you spot clean religiously which, could very well stress your ham out.
The Alaska cage from Zooplus - which is the cage I have for my Syrian, Timi, because it has a plastic base but a wire-bar top, I only fully clean once a month, and spot clean once a week or more depending on how messy he decides to be.
The reason plastic cages needs to be cleaned more is because when your hamster goes the toilet, there's less ventilation to 'air out' the smell and it just sits there. Even when hamsters are trained to use jars or those hamster toilets you can buy (Which in my opinion are rubbish), they're no good with little ventilation and no absorbant materials to absorb your Ham's potty business.
If you have a larger cage - nearer to the Alaska dimensions, then consider leaving the carefresh for a full month and spot cleaning your Hamster's 'toilet spot' every few days or week instead. If you have a smaller cage, you may want to consider upgrading it to the RSPCA minimum requirement and then tackle the cage-changing routine.
The only reason I suspect you have a smaller cage is because you say you bought Carefresh Confetti yes? I know at least in the UK Carefresh Confetti only comes in the smaller bags, so unless you bought a
lot of bags, it's wasted money compared to the large 60L natural carefresh bags.
A bigger cage for your Ham won't only help lower their stress level as you'll have to clean less often, but will also help you with the cleaning because it's a less-frequent chore!
One other peice of advice I can suggest is that you get your ham a 'jar' or tin of some description and put some of their already soiled (i.e. pee'd on) bedding inside, and remove all the other dirty bedding. They'll smell the bedding, think that's their toilet, and go there, meaning you only have to spot clean the jar and their nest when necessary. I've been doing this with Timi since I got him and he's now completely potty-jar trained!