The six-month window for the ₹624-crore buyback by Indiabulls Real Estate, will open on Tuesday. The buyback would be made from the open market. The maximum price would not exceed ₹240 a share, the company said. The maximum size represents 9.91 per cent of the aggregate of the company’s paid-up equity capital and free reserves. Investors will closely track the management’s strategy, as the stock is currently hovering at around ₹175 apiece.