The thinset (used to glue the tiles to the cement board) usually are OK in a couple days.
The grout (fills the gaps between the tiles) are OK after 3 days or so. During this time it it recommended that you spray the grout with a water mist just to keep it damp and retard the cure. Literature recommends it for better end results.
Also, after the three days it is recommended that you apply a grout sealer so that it stays clean and lasts longer. If your tiles are stone seal them as well before installing anything else. That is one extra day.
I phoned Bols (Grout Manufacturer) when I installed my bathroom tiles, as the instructions stated that a two week curing process was recommended. Their technical support confirmed this, recommending that the grout was not subject to serious wetting in that time (i.e. don't take a shower without protecting the grout.)
As for fitting sockets etc - I would be happy to do such work after 24 hours from grouting - such activity will not affect the grout curing.
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