Different estimates on how quickly and how much additional oil would come into world oil markets if sanctions are lifted. The time estimates range from quickly to 6 months for additional new supplies into world oil markets. Estimates of how much production can be added range from 500,000-800,000 barrels a day from private estimates to 1 million additional barrels a day from Iran's oil company, if sanctions are lifted. UK foreign secretary, Philip Hammond, says "there is still a long way to go if we are going to get there." He told a parliamentary committee that the nonnegotiable part is a window of one year advance notice if Iran were to break out and go for a nuclear weapon, which would be based on technical expert opinion of how long it would take Iran to build a nuclear weapon using its knowhow and materials at that Mr Zanganeh took over as oil minister after the election of Rouhani as president 18 months ago. Zanganeh calls the effect of sanctions and the mismanagement of the previous government as "a catastrophe," and he has tried to instill anew discipline in the oil sector. Iran currently produces about 1-1.2 million barrels a day under sanctions, half of earlier levels before sanctions were tightened in 2012 because of the nuclear weapons development issues....