if the stones are smaller than a rice then I call it chaff
I used to drink the 8oz olive oil in less then 10 sec, I was a beer drinker
so I really didnt have any problem doing so untill i got sick of it
on my 6th flush it took me about 20 seconds or so to drink it while I was watching tv
I dont know how your drinking it but 30 minutes is damn long
I used fresh pressed grape fruit juice, mix it with olive oil and I use a fruit mixer to mix it and also use a straw to gulp it fast
I dont know about 30 minutes drinking it, for me I can feel the stones going thru the bile duct in like 15 to 20 minutes