Answer is: Stir the water continuously.
A solute (in this example sugar) will dissolve in a solvent (in this example water) more quickly with stirring, because solvent interacts with the solid of undissolved solute.
Without stirring, solute only interacts with solute on small surface.
Stirring has no effect on how much solute will dissolve; temperature has that effect. Higher temperature, more sugar will be dissolved.
