(Reuters) - LightSquared Inc , the startup telecommunications company bankrolled by hedge fund manager Philip Falcone, is expected to file for bankruptcy protection in the next hours, sources familiar with the matter said. Falcone has until Monday at 5 p.m. EDT (2100 GMT) to reach an agreement or face a default on a $1.6 billion loan, sources said. While the parties still have a few hours left to negotiate, the sources suggested that a last minute deal is highly unlikely and that the filing is imminent. A representative for Falcone was not available for comment. ...