You have 34.3 feet left
For proper fall. Pipe should slope 1" for every 8'.
This pipe has a volume of 24.5 cubic feet.
If that's 3/4 feet, there will be 48 of them.
To prevent siphoning in plumbing systems it is necessary to install a vent pipe within a prescribed maximum distance from the drain pipe - usually within 6 feet when using 1 1/2" pipe with 1/4" fall per foot.
the answer is 69.9 feet
you would need 3 feet of pipe
A 14-inch diameter by 20 foot long pipe has a volume of: 21.38 cubic feet.
Seven miles of pipe equates to 36,960 feet
A 100-foot pipe with a 6-inch diameter has a volume of: 19.63 cubic feet.
A 4-inch diameter pipe that is 3,000 feet long has a volume of: 261.8 cubic feet.
Answering "How many Cubic feet are in a 5.5 inch pipe inside 50 feet long?"
A 6-inch diameter pipe that is 16 feet long has a volume of: 3.14 cubic feet