In my understanding, the way this works, is that there is a protein in dry beans that serve as a protection against the bean being eaten by animals, so that it can remain a seed and grow more beans. When the bean is soaked, and begins to sprout, that protein is activated, and it is undigestable to animals, who learn don't eat that thing. By providing an enzyme that either converts starch to sugar, or by fermentation (converting sugar to alcohol), that protein can be pre-digested, to make it digestable by humans.
There really isnt an average number of showings before getting an offer. Some sellers will get an offer on the first showing, others may not get an offer until after the 25th showing.
How often can I give blood? Men can give blood every 12 weeks and women can give blood every 16 weeks. Check you are able to give blood. If you have an existing medical condition or have a question about your eligibility to give blood you should check the health and travel section before you book an appointment.