The country produced 2.8 million barrels of oil a day last month, compared with 3.6 million at the end of 2011, according to data compiled by Bloomberg. Photographer: Kaveh Kazemi/Getty Images (Bloomberg) — Iran says it could add a million barrels to daily oil production shortly after a deal to lift sanctions is reached, reclaiming the position of OPEC’s second-largest supplier. While the timing of such a move would be at least months away because the sanctions would be rolled back slowly, industry observers largely agree that the capacity is there. Yet going further than that and adding a second million barrels — as the government has said it plans to do — will prove a much bigger challenge. It would take some five years and tens of billions of dollars of investment, according to two former […]