Gaddafi's so-called ceasefire will last as long as it takes to get his troops, tanks and artillery close to Benghazi. He would then launch a pre-emptive strike at dawn with ground-attack aircraft and everything else at his disposal. He will then call for a second cease-fire.
All the committed UN forces need to be close by, on immediate readiness and with a 24-hour CAP. Anything less just will not do.