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Answer:
There isn't one single size for this class. A schooner is generally defined as a fore-and-aft rigged (as opposed to square rigged) sailing vessel of (minimum) two or more masts, having a foremast shorter than (or not longer than) the mainmast.

Schooners come in all conceivable lengths, but the largest ever built was the all steel Thomas W. Lawson (1902), seven masts, 475 feet length overall, displacing 13,860 long tons. Lawson was a commercial failure for many reasons, but she holds the distinction of having been the largest schooner and the largest pure sailing vessel (no engine) ever built.
First answer by Chaacker. Last edit by Chaacker. Contributor trust: 186 [recommend contributor recommended]. Question popularity: 3 [recommend question].