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Overall life of the resin will greatly depend on the quality of your water from spigot. I've ran a DI-W20 for several years now on my pressure washer setup with a bypass and additional carbon/sediment pre-filters. I tend to need new resin every year washing 1 car once a week.
I've also been chemically refreshing my resin instead of buying new but there are times I've been lazy and just bought. It's a process but costs <$15.
The best way to get the most life is to run an RO membrane and have a reservoir since it has low GPM output but I've yet to look further into this seriously. My understanding is your get 10x (if not more) life out of the resin.
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