A mom turned down a job because it didn't offer enough paid time off.Jordi Mora igual/Getty ImagesSherri Carpineto is senior director of strategy and operations Ascom Americas.A few years ago, she was headhunted for a VP role but only offered 10 days off.She said she always negotiates time off, because flexibility is critical.This as-told-to essay is based on a conversation with Sherri Carpineto, senior director of strategy and operations Ascom Americas.