How long to leave grout drying?

flyingbanana_2

Alan_M wrote: »

What grout was used and how wide were the joints?

Buildfix Flexible Wall and Floor Grout and 4mm spacers used, although because of the slate some of the gaps are very slightly smaller and slightly larger too!

Alan_M_2

From what I can see, Buildfix is a Mapei product, but they have no technical specs on their website.

I'm afraid that's a new product to me so I can't be a great deal of help other than suggesting you thoroughly read the packaging and comply with the manufacturers recommendations.