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1/4 inch per foot.
Probably the wrong size flange. Is the flange a toilet collar? If so the pipe is probably 4 inch.
you need to know the viscosity of the liquid - molasses or alcohol?
Wouldn't recommend it as things may back up in the drain line. 4" line is the norm ... you want to get rid of waste, not keep it around longer.
if each mark is 1/16 inch then 4 marks is 4/16 inch = 1/4 inch