ScriptApp.newTrigger("RefreshRates").timeBased().inTimezone("GMT").everyHours(1).nearMinute(0).create();

function createWeeklyTrigger() {
    var days = [ScriptApp.WeekDay.MONDAY, ScriptApp.WeekDay.TUESDAY,
                ScriptApp.WeekDay.WEDNESDAY, ScriptApp.WeekDay.THURSDAY,
                ScriptApp.WeekDay.FRIDAY];
    for (var i=0; i<days.length; i++) {
       ScriptApp.newTrigger("your_function_name")
                .timeBased().onWeekDay(days[i])
                .atHour(11).create();
    }
 }