Average innings per game for the Twins starters:

Blackburn 6.5
Perkins 6.5
Hernandez 6.4
Bonzer 5.6
Baker 5.5
Slowey 5.1
Liriano 3.4

edit for comparison's sake
in 2007:

Santana 6.6
Baker 6.5
Silva 6.1
Slowey 6.1
Bonser 5.8
Ponson 5.4
Garza 5.5