The time is in minutes or seconds depending on whether the rotational speed of the mixer is in revolutions per minute or revolutions per second, respectively. For a typical pitched-blade turbine the dimensionless blend time for 99% uniformity is: 6.34 = Blend time x Rotational Speed x (Impeller Diameter/Tank Diameter)^2.3 x (Liquid Level/Tank Diameter)^-0.5 as shown in the attached dimensionless equation. For a straight-blade, radial flow turbine, the dimensionless value is 4.8. Although by the blend time value the straight-blade turbine takes less time, it takes more power and/or torque than the pitched-blade turbine for the same result. The dimensionless blend time value for a hydrofoil or propeller is 16.4 but the exponent on the impeller to tank diameter ratio is 1.7 instead of 2.3. Simple factors associated with an exponential decay function can be used to estimate times for 95% and 99.9% blend uniformity.