Porcelain tiles problem

[jarramag]

My tiler has tiled the bathroom with porcelain tiles sized 600x300. The problem is, the tiles have not set yet (they sound 'wet' when pressed) and we have no idea why.

Some of the tiles have been on the wall for 10 days.

The adhesive used was tilefast non-slip ceramic wall tile adhesive confirming to bs5980 type 2 class b as recommended by the tile supplier.

The room is 3.4m x 3m and the bath is used twice per day (which may cause condensation?)

So, my questions are:
1. Will the adhesive dry out?
2. Should we grout the tiles to prevent further condensation and if we do, will there be problems later on?

Many thanks for any help or advice you can offer.