I run around 20 portals, most of them are 2x1, a couple 2x2 and a single 4x2 and I can fuel them pretty easily. I even have oort left to sell and to craft deco blocks.
I only hunt like 40 minutes when there is a hunt happening(and I dont always attend to hunts), recently started hosting and thats the only time where I hunt for 90 minutes.
People who can’t afford to run their portals is because they have too many.