On average, how often do you masturbate only to your own imagination (i.e., vs. masturbating "to" something)?

I'm very much a erotica/hentai/doujin kinda gal, but less "consuming media while i masturbate" and more "Consuming media to build more specific fantasies for later"

Hot photos of people or hot art/illustrations are both good for me, but i don't really get off to most porn with real actors in it. There are a couple of kink/niche sites that do it for me though