Legendary bond manager Bill Gross’s performance has been “disappointing,” and will take time for him to recover from losses and outflows, according to Dick Weil, the chief executive officer of asset manager Janus Henderson Group Plc. “I think the sort of underperformance we’re seeing is challenging and disappointing to him more than any of us,” Weil said Thursday in a Bloomberg Television interview. “It’ll take some time to dig his way out.” Gross’s Janus Henderson Global Unconstrained Bond Fund ended July at $1.25 billion, down almost $1 billion from its peak in February.