none said:

What duration do you think Prometheus covers. two three days?

The captain celebrates Christmas when they wake up from cryosleep. Rapache in her rip-off-of-Alien log says its new years day. So a week, but I can't account for more than two days of incidents. They land, explore, come back, leave the guys, go back to find them, come back, discover pregnancy (10 hours after encounter), I'm sure she's not knocked out for more than a few hours, has baby, goes back in, everything goes to hell. Done. Maybe the first few days are just them approaching the planet so they have time to recover from their sleep?