16 glasses
1 gallon makes 128 ounces and 1 ounce is 0.0078 gallon in U.S measure. There are 8 ounces in a cup, 2 cups in a pint, 2 pints in a quart and 4 quarts in a gallon. That makes 128 ounces in a gallon US. In UK 20 ounces to the pint, 8 pints to the gallon which makes 160 ounces Imperial measure.
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4.225 8-ounce glasses of water (4.225 x 8 = 33.8)
About ten glasses.
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This depends of course on the volume of the glass considered. Volumes and forms of glasses are very different.