I just completed a small project to re-tile my shower. My split-level is almost 20 years old, and was built by Joe Cheapo Construction. The shower walls were 4x4 tiles glued (no mortar) to white 1/2in gyp board and grouted.
I tore it all out, let the wall cavities dry for over a week, and hung Hardibacker floor to ceiling. I was able to re-use the existing floor pan after actually attaching it to the studs (the only thing holding it to the floor was the drain). I set all the wall tiles, then I completed the grouting about 2am Sunday night.
How soon can I begin to apply caulk, install the door, and trim-out the plumbing. The instructions from the grout says 21 days. It's getting a little old dodging rubber duckies and Barbies in my 3-year-olds shower/bath upstairs.
Thanks for your help!