The guidelines for this shop are ambiguous in this area. The minimum time at the location, for Dine In, is 20 minutes.
The time gaps between each meal cycle do allow for starting and potentially finishing before the next meal period.
In general, most of us familiar with this shop do try to start it so we can finish within the window. I do not remember anyone complaining about a rejection for their end time being outside the window.
Personally, I would arrive no later than 15 minutes before the thru time which would end the shop past the end time but before the next cycle.
For phone or cyber orders, I try to order early enough to arrive at the location before the thru time. This is based on my experience with another MF client where both orders had to be placed within the window.
My posts are solely based on my opinions and for my entertainment, contact a professional if you need real advice.
When you get in debt you become a slave. - Andrew Jackson