I've waited months to process film and I haven't seen any real issues with it. It's usually better that way because then you forget what you shot and lose the expectation of how you thought your images should look, right? I've been shooting a lot of slide film and the processing doesn't come cheap so I have to squirrel it away until I'm able to pay for it. They say that slide film should be processed IMMEDIATELY but I think that's mostly for people who have to deliver a product or other people just spouting off what they've heard before.
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