Protecto wrap: how long to wait until grouting?

[Johnski]

I guys, I just finished installing 12x12 marble tiles over protecto wrap (over 23/32 osb) in our 30 sqft bathroom. how long till I can grout her? I have waited 24 hours in the past but that was all over concrete. Thanks!

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[Houston Remodeler]

Johnski,

24 hours will be fine. Of course in contractor speak 24 hr = the next morning.