Liberation Day (5m) -> The Outlaws (5m) -> Zero Hour (20m) -> Smash & Grab (10m) -> 40m total aproximately
-> Evacuation (20m) -> Outbreak (25m) -> Train Robbery (20m) -> Safe Haven (10m) -> The Dig (takes ages, on hard and brutal, dunno if it's much shorter on normal because I guess there are a lot less things to shoot with your laser beam, call it 35m but maybe a lot shorter). -> 115m total
-> Whispers of Doom (20m) -> A Sinister Turn (20m maybe a lot less on normal) -> Echoes of the Future (5m) -> The Mobius Factor (10m) -> 170m total
Cutthroat (20m) -> Supernova (20m) -> Maw of the Void (30m) -> 240m total. That's 4 hours to get to Char.