For a 2" drain pipe horizontal run in a bathroom, what is the correct slope drop per 10 feet?
Also, can a single 2" drain pipe support a separate tub, shower and 2 sinks?
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1/4 inch per foot is most common and is the minimum allowed. Maximum allowed is 3 inches per foot
So on a 10 foot section that would be 2.5 inches total slope minimum and 30 inches maximum.
For the second part of your question see the answer to this question.