House training a puppy when you don't have a lot of time?

I have a 4 month old chihuaua, i work 12 to 16 hours a day and my fiance don’t have a lot of patience, so i am trying to find a way to house train the puppy that’s easy and that can be done around my work schedule, he keeps doing his buisness on the carpet we have gotten it cleaned and have even bought our own carpet cleaner, but the carpet still smells because he won’t stop. the puppy pads we got don’t seem to be any good. and taking him outside don’t either, he will walk outside for 15 to 20 minutes or more sometimes and not do anything, then as soon as we go in he will go on the carpet. I don’t know what to do, but ii have to stop this behavior before it gets too out of hand. Is there a way?

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