Then you will have to wait another 24 hours.

How long does it take to grout a shower. You can do this using soap and a sponge. After inspecting the shower and checking if the grout is cracked, start by cleaning the area. On average, grout takes between 24 and 72 hours to fully cure.

Time period to use the shower after grouting. Under optimal conditions with heat, good airflow, and low humidity levels, most grout will dry in this time. Moreover if you understand it then you can.

With sealant, the time take taken is more. For best results and longevity, keep. And the grout boost faq (pdf link) says:

After sealing, wait a minimum of 24 hours before using the shower; Professional tilers typically spend between 6 and 8 hours on a job like this. Clean & remove the grout.

Cementitious grout usually takes 72 hours to dry completely, while epoxy grout can take up to 24 hours. However, this time can be increased or decreased depending on where you are applying the grout. Wipe off your tiles with a dry cloth to ensure they won’t be.

Wait for 5 to 15 minutes for the first coat to dry. Once the grout is dry, you can use the shower as usual. There are several factor and condition on which it depend.