Boost Phase 2 : The phase of a missile trajectory from launch to burnout of the final stage. For ICBMs, this phase typically lasts from 3 to 5 minutes, but studies indicate that reductions to the order of 1 minute are possible
Federation of American Scientists, Glossary of Acronyms and Terms, Washington, DC,USA 2004. https://fas.org/pubs/_docs/10072004163905.pdf, (DPrep - Amer) {1003}