Three years into the biggest oil downturn in a generation, industry bosses see the recovery slipping further from view. It could easily take until the end of the decade for better times to return to an industry that’s already endured a longer slump than most people expected, according to Total SA Chief Executive Officer Patrick Pouyanne and Weatherford International Plc head Mark McCollum. Executives gathering at the World Petroleum Congress in Istanbul said they’re still focused on repairing battered finances and resetting their operations to withstand low prices. “In terms of the magnitude of damage this is by far the worst” industry downturn, McCollum said. It may take until 2020 for demand growth to accelerate enough, or for a supply gap to emerge that U.S. producers can’t fill. […]