Just did the math for the upcoming Lostbelt chapter (source: Cirnopedia). Here’s the AP breakdown:
Main quests (22 sections): 878 AP
Free quests (14 quests, one unlockable): 873 AP
So it should take just a little over 3 days to finish the main quests – just enough to finish over the weekend. For those who haven’t finished the EOR free quests, that means you’ll have about 3.875 days of 1/2 AP event left after finishing Lostbelt 1, since the event expires on April 2nd, 9:00 PM PST.
Feel free to double check the math in case I made a boo-boo!