You can add it after midnight on a day by day basis. You do not have to purchase it for all of your ticketed days. So if you don't want it for your first two days but want it for your third day, you don't have to pay for it for Days #1 & #2. Just log onto the MDE app on the morning of Day #3 and purchase it for that day.
I have never heard of G+ selling out. In fact, it can still be purchased late in the day even if there are no LLs available.
You are not likely to want to purchase G+ in the afternoon because most of the LLs that it will have most useful for will already be gone. You will want to start using it early in the day.
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