What is the burden of challenging attorney fees as excessive because too many hours are claimed?

"'In challenging attorney fees as excessive because too many hours of work are claimed, it is the burden of the challenging party to point to the specific items challenged, with a sufficient argument and citations to the evidence. General arguments that fees claimed are excessive, duplicative, or unrelated do not suffice. Failure to raise specific challenges in the trial court forfeits the claim on appeal.'" (Lunada Biomedical v. Nunez (2014) 230 Cal.App.4th 459, 488.)