The only way you will get liquid out your comfrey tube in a week is if the pop bottle leaks!
It can take up to 90 days to get the concentrate to flow. I appreciate that it is a very good method of obtaining concentrate. The leaf has to completely biodegrade before you get any liquid and this, depends on several factors and it takes considerably longer than you are making out. I appreciate your enthusiasm but you will have people thinking that they have failed when they do not get concentrate in a week. This in time will put people off using Comfrey and this would be a great shame because they will miss out on the wonderful properties contained in the concentrate.
For the ten thousandth time stop exaggerating.
JB.