From 2010 onwards, military spending in Indonesia was aligned to the Minimum Essential Force (MEF) strategic plan 2010 – 2014 requirements. Under MEF 2010 – 2014 funds of up to Rp150 trillion ($16.41 billion) to spend over five years to procure major weapons systems, Rp50 trillion $5.47 billion) will be used to accelerate achieving the Minimum Essential Force, Rp55 trillion ($6.02 billion) for procurement and Rp45 trillion ($4.92 billion) for maintenance and repair. Subsequent funding would be made available to fund the strategic plans of MEF 2015 - 2019 and MEF 2020 - 2024 to achieve the strategic goal of Minimum Essential Force.
Question: How many years does each strategic plan cross?
Answer: 4