2 hours if unfilled or partially filled.
4 Hours if filled.
Based upon a standard 60/40 blend of gravel and pumice aggregates in the concrete block mix
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Volume of 1 inch block is 1 cubic inch Volume of 1/2 inch block is (1/2) x (1/2) x (1/2) = 1/8 cubic inch Therefore number of 1/2 inch blocks in 1 cubic inch block = 1/(1/8) = 8
9 inches x unknown x unknown
More information is needed EG what type of 12 inch blocks there are many(see link below). Also what way up are you using these blocks. http://www.boralbestblock.com/product-lines/masonry/standard-block/12-inch-block
Weight of 50ft section of 3 inch hose with water in it?
109 lbs with no water