How quick is it to get 100 shards for Farmboy Luke?

a 1/3 drop rate on an 8 energy cantina node and you need 100 shards.
3 * 8 * 100 = 2400 energy needed to be spent on cantina to get those 100 shards. You have 8 days so that's 300 energy a day. You get 120 every day from time passing +45 at noon, so that leaves 135 energy beyond what you get for free. Buy a refresh a day, plus one extra some other day and you should make it on the last day.