My children are 13, 10, and 5.
I get up around 7:00 (I exercise and have quiet time.)
My 10yo gets up at 7:45 and showers, so I still have time to myself until he's done around 8:05.
My 13yo gets up at 8:15 (she showers at night.)
We are usually sitting at the table at 8:30 with our breakfast, ready to start.
If a kid is not at the table at 8:30, then that kid is docked $1.00 of allowance. It works very well. :)
**As for my 5yo, she gets up around 8:00 on most days. She has significant special needs & is more like a 2yo developmentally, so none of this applies to her.