What Time is It?

Overheard at our house about 9:35 a.m.
Mom:  "What have you been doing up here?  Move it.  We're going to be late for piano lessons.  I'm tired of being late all the time.  Get moving."
Overheard at our house about 9:40 a.m.
Mom:  "Seriously, what are you doing?  Decide what you are going to wear.  Floss and brush your teeth.  Brush your hair. When you're done in the bathroom, get your music together and in your piano bag."
Overheard at our house about 9:45 a.m.
Mom:  "Girls what do I have to do to get you moving?  Piano lessons start soon.  We need to leave right now.  Are your piano bags ready?"
Blond twin:  "Um, Mom, remember that Miss Anna changed piano lessons so she could sleep in."
Mom:  "Oh, that's right. Piano lessons don't start until 10:30 now.  We're really not late for a change."
Blond Twin:  "Yeah.  We're not late!"