You have no idea how much I've tried to see if I could use the 8 hr or five hr or even four hour I would accept. But the more I read the more I realize that it wasn't going to happen unless I risk doing harm. I too wish so much it wouldn't be every 3 hr. That is so hard to do for three days! The only chelator I found that doen't have such a rough schedule is DMPS but I don't know much about it. Wishing you the best. Vicky