I don't use strips, so I'm not the best to answer. If you use bullets, expect around 50 5v pixels and 120 12v pixels before you need to inject power (this is an estimate and can change depending on vendor). Once you get data to the first node, the data basically gets regenerated. Depending on controller and wiring, there is a limit to how far you can go from output to first node. Some things to keep in mind.
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