Every 5 or 6 days is definitely excessive. No matter what's going on outside, it should not be like this if the door, windows, and vents are normally closed. Filters will sometime get dirty looking fairly quickly but that doesn't necessarily mean they need changing. Some actually filter better as they begin to trap.
It sounds like you're actually replacing the filter and if so, your best bet may be to buy a re-useable filter that can be washed. You might also get a few more days before changes if you installed a washable thin foam type filter ahead of the main filter you have now.
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03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E
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