No problem. Congrats on your new pet. I have a hand raised chinchilla myself and he is wonderfully tame.
It is unwise to leave the dust bath in the cage for several reasons. Chinchillas should not be bathed every day because the dust will leech the lanolin from their fur which is needed to condition their skin. This causes dry skin and cracked skin on their feet which can lead to more serious problems down the road.
Also they use it like a litter box and it gets soiled with urine which is very irritating to their skin and can increase their risk of fungal infection.
Another reason is that some chinchillas if given too much access to dust will loose interest in it and not dust vigorously which is needed for them stay clean and healthy.
I always recommend dusting every other day unless there are health issues you are dealing with such as eye infections or cuts that are healing in which case dusting is not advised until they clear up. If you are having issues with dry skin skip an additional day or two to see if it clears up.
Personally I put the dust bath bin in my bath tub and close the shower stall. I leave him in there for about 10-15 minutes. You don't want to dust much longer than that.