I have finished grouting this table! The adhesive held even though it was just barely 24 hours old.
After covering this table with the wet grout, I let it set on the table for about 45 minutes, then I used the rough side of the sponge to rub off the excess grout, followed by a damp sponge, then a very soft old sheet to buff off the excess. Finially, just to be sure, I misted the whole table with a spray bottle - I did not want any of the grout to crack. I was able to find a very large plastic bag to cover up the table to "cure". In three or four days I will uncover this table and do the finial clean-up and then it is time for this table to go home.
I even had time to complete a simple tray for Valentine's Day.
It is a bit odd to finially be done.