This depends on the manufacturer of the material and what type of material is on the bolt. A bolt is not necessarily a unit of measure for material, it is simply a means of wrapping the fabric neatly for both the transport and sale of the material. A bolt can also only carry a certain amount of weight depending on the strength of the cardboard. Therefore, the amount of material on a bolt can vary greatly. In regards to "how much" meaning "how much does a bolt of material cost" (if this is what is being asked), this also depends greatly on the type of material. Fabric can range in price anywhere from <$1 a yard to >$200 a yard depending on the type.
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The amount of yardage on the bolt varies. From the manufacturer it is generally around 50 to 100 yards. Then the distributor will re-roll into 15 - 25 yards to sell to the retailer. Sometimes the amount the retailer receives is actually less than he ordered, and there can be a conflict. The amount is generally printed on the end of the bolt.
Bolts of fabric have a varied amount of yardage. It tends to be a large amount of fabric 40 or 50 yards is common.
Quilting cottons are typically 15 yards, unless it's a "short bolt" which I've seen anywhere from 6-10 yards.