"I'm not a good searcher" The dwarf gives a short answer and walks around, examining the ground without much interest.

OOC: VinGoodman, where does it say you are here for a long time? I don't see the DM saying "X minutes pass without anything happening" nor does it matter, because you can't retroactively take 20.

If Gundushel gets into 5ft distance of something made of rock he gets a roll as if he was actively searching for it, so in case it does happen: (1d20)[19] +2 for stone stuff.