Breakfast before park opens

[singingpixie]

I'd asked an earlier question about breakfast at Whitewater Snacks, but when I stumbled upon a 7:40 reservation for Carnation Cafe for our one-day visit (on Sun 3/1 when the park opens at 8), I jumped on it. I'm optimistic that we'll be able to eat quickly and be ready to go at about the same time as if we'd been at the gate for rope drop.

A few questions:

• Is 7:40 the earliest reservation offered, or should I keep an eye out for an earlier one?
• How early would we be able to get into the park? Where is the "early dining reservations" entrance?
• How long should we expect breakfast to take, assuming we decide what we want ahead of time? I assume they'll want to turn our table to be ready for the next guests at park opening anyway.

Thanks!