public function test(Request $request)
    {
        $time = time();
        $sqlArr =[
            'select sleep(2);',
            'select sleep(2);',
            'select sleep(2);',
            'select sleep(2);',
            'select sleep(2);',
        ];
        foreach ($sqlArr as $sql){
            Db::select($sql);
        }
       return json(['code' => 0, 'msg' => 'ok','tt'=>time()-$time]);
    }

{
"code": 0,
"msg": "ok",
"tt": 10
}