Is there a way to discard of hourly measurement in MS Project, and instead having it track only the amount of days I input?
The simple answer is, "no". Regardless of how you enter work or duration, internally Project tracks everything to the nearest minute. If your end goal is to set up your plan for a "day rate" (i.e. a resource charges by the day regardless of whether that resource works 1 hour, 8 hours, or whatever), then you will need a VBA macro to convert everything into a day rate.