• N5: Jun - Nov (6 months)
• N4: Nov - Dec (2 months)

=> N5: Dec 2017 (6+ months)

• N4: Jan - Apr (4 months)
• N3: May - Dec (8 months)

=> N4: Dec 2018 (6 months)

• N3: Jan - Feb (2 months)
• N2: Mar - Dec (10 months)

=> N3: Dec 2019 (10 months)

• N2: Jan - Apr (4 months)
• N1: May - Dec (8 months)

=> N2: Dec 2020 (14 months)

• N1: Jan - Nov (11 months)

=> N1: Dec 2021 (19 months)