Not washing OILY hair

Every day I strive to not wash my hair to try and get it more healthy, but my hair looks and feels so absolutely disgusting that I can’t help but give in when I shower. Is there some magic amount of time I need to get through to see the benefits of not washing my hair as often or does oily hair just need to be washed every day? I just tried dry shampoo for the first time the other day and I wasn’t a huge fan. Do I have any other options? 😩