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4 or bigger. I can do all that the smaller blades can do with the bigger blade and more that the smaller blades cant do.
I like a small blade under 2" paired with a larger 3.5-4" blade.
3.25 - 3.75 inches is my sweet spot for non-slipjoint folders.
In terms of the blade, my current EDC, a small Insingo has such a useable blade from heel to tip that 2.97 inches feels more like 3.25+
I think this depends heavily on hand / overall body size. I find most knives over 4.5" in blade length to be hard to use as cutting tools for general EDC. It's a lot easier to cut tape with a Volt II than a 0600, you know? Less to maneuver around, more agile, easier to get the right angle in my experience - but that might just be a physical thing, as I'm only 5' 10" and have midsized hands.
I'm so used to carrying folders with blade lengths of just under 3 inches, due to local restrictions (to take a phrase from "Shawshank Redemption" I've been "institutionalized"), that my favorite has become 2.99" exactly. I try to keep 70% of my purchases in the 2.75"-3.25" range.
No option for my preference of 2.75-3.25, so I selected 2.99 inches or less.