A lawyer behind the largest jury verdict of the year put his client—a millionaire widow suing a banking behemoth—on the stand for nearly four days.

That’s a long time in front of a jury, any way you slice it. But Alan Loewinsohn, a senior partner at Loewinsohn Flegle Deary Simon in Dallas, realized he needed this time for the jury to get the whole picture of his client, Jo Hopper, who claimed JP Morgan grossly mishandled her late husband’s $26 million estate.