Explain what "enough time to farm for Thrawn" means please

I should have my Phoenix team at 7* in a couple of days -- the question is would I be able to survive the event if I have only 3 toons at XI by then? Due to gear bottleneck, even assuming I buy a good deal of it outright, I'm trying to see if I can make it by having Sabine, Ezra and Hera maxed and Zeb and Kanan at "functional" (e.g. 85/IX/so-so mods).

Hopefully that's enough. I have Chopper at 7* but I'm really not that keen on wasting gear or ability mats on him if I don't have to.