i have earth moving oragisms about 4 times a week. i dont time them. most are pretty long - doubt they are half a minute though.... the groud does shake and its amazing the kid stays asleep. but im not a slut. my # is only 2~ but thats mainly because i met dh young (18) and he is the reason for all that (the earth moving and me only ever needing him and not sleeping with anyone else since him.) so i have to give him his due credit.