Well if you are happy with 7M T of ore: Nameplate process is...

Well if you are happy with 7M T of ore:
Nameplate process is 210T per hour. Say they run 6 days per week full ball every week = 210T x 24 x 6 x 52 = 1.57M T/ year (rounds up to 1.6Mtpa)

7Mt / 1.6Mtpa = 4.4 years

No reason to limit it to 7Mt unless confirmed otherwise the data there indicates 14Mt is closer accuracy right now so that would be 8.8 years. Full ball. 6 days per week. No stoppages. No holidays. No worries