Bung: I'll be a contrarian and say that 24hrs is too fast for a nest to be destroyed and what you see is the visible ants have gone elsewhere. Most of the research suggests using a low concentration (1 - 2%) so ants keep feeding and up to 10 weeks to kill all.
I didn’t say that the nest (or the ants, for that matter) would be destroyed in 24 hours - I said that within 24 hours the ants would be gone (from where they ate the poison). Which they always are - and they don’t come back - but who knows if they’re dead or gone elsewhere. I haven’t seen them show up elsewhere in a short timeframe - so they’re dead to me.