BEIRUT — Thousands of Americans whose vacations and business trips to Lebanon have degenerated with sickening speed into stints in a battle zone remained stranded here under Israeli bombardment Monday, their frustration and anger mounting because the U.S. government hasn't gotten them out faster. Waiting around Beirut with bags packed and fingers crossed, U.S. citizens derided the embassy for busy phone lines, a lack of information and gnawing uncertainty over when and whether they will get out. Hundreds were expected to be shipped to Cyprus today, but how long the full evacuation will take remains uncertain.