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I mm per day is standard from what I found. I had to wait 77 – my installer came out and put down testers and came almost every day to check readings to ensure it was in the right range before they would prep and lay the LVT. Mine was done last month. They also put down a damp membrane for a little extra as our numbers were a little off in one section to be sure. I will stress to find a reputable LVT installer and do it right. I had a friend who had an issue and her whole floor lifted during the first year after installation and it was 7 years with court process to get it made right. No one deserves that!