Depends on your definition. Is a picture of boobs porn to you? Is anime like ecchi anime porn to you? Talking about softcore pornography here. If softcore is included then probaby every second day at least, in some form. I really enjoy looking at pretty women, even if it's just dressed. It does give me more motivation to live sometimes.

If we're just talking hardcore pornography and that includes any materials depicting or describing sex, including video pornography, doujinshi and other written/drawn material then probably anywhere from 1-6 times per month.

I've gone longer periods of time without porn and even fapping entirely but it never brought about a meaningful change, though I can see how frequent consumption affects my behavior a lot. And by longer I mean anything from 6-9 months.

Over time it decreased for me, even though my testosterone has definitely increased. Porn browsing and consumption used to be a bigger part of my life but it's just a waste of time now. I know my triggers and tastes and if I want to get off well or hard, what I need to do. I grew up with this (started around 13, am 27 now). Most of the time I just want to do something else