You should wait another 3 hours before going over the tiles once more.
How to put grout down on the floor.
To grout a tile floor start in the farthest corner of the room scoop some grout on the floor with a trowel and use a grout float to spread the grout over a small joint.
Then wait 15 30 minutes for the grout to set before wiping off excess grout with water and a grout sponge.
Take a damp sponge and make light passes across the tiles diagonally to clean off the excess grout.
Pour a quart to half gallon of grout on the tiles.
As soon as one section is complete wring the sponge until no water drips from it before cleaning.
Use this method for both pre mixed and powdered grout.
Demonstration of tile grouting technique using correct technique with tips for best practices.
No matter how good you are with a sponge once everything is dry usually overnight there will still be a grout haze on the floor.
Use a hard edged rubber grout float and hold it at a 45 degree angle.
Grout haze happens when grout dries on a tile dulling the finish.
Wipe the floor clean.
Spread the material in sweeping arcs pressing it into the joints to fill them completely.