Conservation of the truffles:
From Edabea we recommend that from the time you receive them, to the refrigerator (at between 2 and 4 degrees), vacuum (as they go) and in the dark, for up to 2 weeks, after that period of time they can begin to lose power.
To keep them longer or once opened, you have to dry them. Once dry, they last for months in good condition. You can do something like this (substituting the orange silica gel, if you don't have it, for rice):
Dosage of the truffles:
This is a delicate and very personal issue, something that is learned over time and experience, there is no standard dose, some need 7 grams and others need 20.
From the experience accumulated over the years, it is better to have a disappointing first trip than one that is too intense, with the first you can adjust the dose for future trips, with the second it is very likely that you will not try again.