How long can this fuel line be

Fuel line in yellow. QUESTION:This is just a mockup, but how long can this be (fuel line dist between the pump & carb)? The pump is standard 383/440 carter fuel pump with output at 6-7psi. I'm experimenting with the routing to get away from heat sources but I also do not want to accidentally create a fuel starvation problems. Anyone know this from past experience? Graci.
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