Q. In regards to the recent teshuvo #451 on the brocho recited on the peel of an esrog that was turned into some kind of jam. It isn't clear from the answer what brocho you recite on the jam.
Also on # 452 I have two doubts Does Rav Shlomo Miller Shlit"a response apply to other foods that contribute to forgetfulness of Torah? When you mentioned that "roggil" could be even less that 30 days, do you mean he eats olives once every 40 days or 20 days?
A. Horav Shlomo Miller's Shlit"a opinion is that if you can still recognize in the jam the pieces of esrog peel you can recite Hoetz, otherwise the brocho is Shehakol.
On the last question; the Poiskim that maintain that "roggil" is thirty days, it means that if you eat olives more than thirty days apart, you are not considered "roggil" or a regular eater and there is no issue. If you eat them more often on intervals less than thirty days apart, there could be a question. Horav Shlomo maintains that eating them at shorter intervals apart than thirty days may still not make you a regular user and thus you would be permitted. He did not specify, how much less than thirty days.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller Shlit"a