This morning, I spent 2 hours. I got 21 collectibles. I hit 4 zone buffs. I sent out 3 geologists.
Most of the 2 hours was waiting while the freezes cleared.
I have managed on a good day to send out all 120 explorers. It was a Saturday and took 2 hours. That is over 10 times longer than pre-Unity.
I get errors that force me to reboot the game and sometimes to reboot the computer.
Event? I am not sure I can last that long.