I think they should use the HUNG principle. Each jury member writes on a piece of paper one of the following:
H, Happy to go along with others (unlikely, but I bet it has happened)
U, Undecided
N, Not Guilty
G, Guilty
Obviously if they are all N or G, they just go through the motions and probably announce the verdict later today.
Combinations of HUG are good, so they have a group HUG and proceed to all eventually get to G. Verdict maybe late today or early tomorrow.
Clashes of N and G are bad, so a collective UGH would be uttered. If one is holding out, a metaphoric GUN is held to their head, until they hopefully come round. Verdict late in the week.
If they can't all eventually agree, a general NUH is arrived at, and the trial is declared HUNG. Unsure how long the judge would give them before this is declared.