Also Rich, a typical 4 day could be something like this, from the MIA system:

2pm MIA-CVG
CVG-ORD
ORD-CMI 10pm
9 hour overnight


7am CMI-ORD
ORD-DSM
DSM-ORD
3 hour sit
ORD-CMH 5pm
19 hour overnight


2pm CMH-JFK
4 hour sit
JFK-PIT 6pm
14 hour overnight

8 am PIT-MIA
MIA-EYW
EYW-MIA
3 hour sit
MIA-GGT
GGT-MIA 5pm
Customs.....

worth lets just say 21 hours block.

I just odd balled everything, and its not to be close to what things are, but its a good rough idea.