In the original announcement, he says in the very first bullet that we can now start whenever we want.
Of course, that is kind of contradicted in the game by not letting us start until a wait period is over. Once you get past the wait, though, it is true that we are now entirely in control of when we dive.
So, the grace period concept is obsolete. Once the wait period is up, we can now start whenever we want. If you don't start, it will sit there forever, waiting for you to decide to start diving again.
The dives now are kind of the opposite of before.
Before there was a window of time in which we could dive, and no dive all the rest of the time.
Now, there is a window of time in which we can't dive, and we can start a dive any other time.
Level 80 on iPad - Susan with geranium avatar if connected to FB, otherwise BethMme
Level 69 on Windows 10 laptop - Susan with monkeyhead avatar
Township player code: A9FMP2
Farmville Tropical Escape code: FI6E-WHJ0 (last digit is zero)