Add stream duration to layout header

web/pages/viewer-info.tsx

@@ -1,6 +1,5 @@
 /* eslint-disable react/prop-types */
 import React, { useState, useEffect, useContext } from 'react';
-import { timeFormat } from "d3-time-format";
 import { Table, Row } from "antd";
 import { formatDistanceToNow } from "date-fns";
 import { UserOutlined} from "@ant-design/icons";