Answer for Skimmed walls. How long before it all dries out?

If a drywall compound was used 24 hours is enough time. Gypsum based products dry and cure fast.

The only way to check the walls for a pattern is to prime it and see. Use an acrylic stain blocking primer. If there is still a pattern from the old wallpaper then more skimming is needed. this can be done over the primer.

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