The FAQ doesn't say anything about having to edit/save a basket only during trading hours.

It mentions a thing called draft bucket:
"After you build your basket, select "Save draft," and the securities that you've picked and their target weights will be saved for you to buy now or later."

"Visit your personalized basket dashboard where you will see all your baskets and draft baskets. View an individual draft basket, edit, or delete, or even build a new one."

"How do I trade a draft basket?
Visit your basket dashboard and select "Edit and Buy" for the draft you want to trade, ensure the securities have target weights that total 100%, and select Continue. You're now set to finish building your basket, edit your draft if you'd like, and trade it during market hours."

It looks like a draft bucket is equivalent to an M1 pie. It doesn't actually trade until you connect it to an account, whereupon it does the trades.

I have a number of detailed questions about how it all works, which are not addressed in the FAQ.
I guess you have to sign up for baskets to see how these work.

I am amused about people choking on the $5/mo fee. Up until recently we were paying $5-$20 commission per trade. Datek was $9.99 per trade. BrownCo was $7 or $12 for limit orders.