Character Strategy: Stormtrooper Han

Leia and STHan have one zeta each. R2, Farm Boy Luke, and Old Ben have two zetas each. That is a total of 160 zeta mats needed for this team. You can get a zeta every other day from fleet shipments. That's 320 days, although you will sometimes get lucky and receive one or two a week from ship challenges. I'll just guess that it will take about 7-8 months to unlock all of those abilities.