I hope you realise that was not a feeding block IOU1 and were just enquiring as to how they work compared to putting daily amounts into containers.
I know some people use the block feeders but I am not a fan of them. I am not keen to add something to my tank that may, or may not, last the distance, or dispense the food evenly over the time required. If it pollutes the tank while I am away there is nothing I can do about it. Same goes for auto feeders. I know others use them too but I would be worried about them clogging up, especially as I feed a lot of flake foods which don't do so well in auto feeders.
Alan, just ask them to feed them on the 7 days allowed and not feed them on the last day (or the first day). No problem.
You can also get containers that have compartments for each day morning noon and night so relabel them days and you will be right.