Google apps script 300秒（5分钟）时服务不可用

我知道脚本限制是360秒，但我得到的服务不可用的任何超过300秒

以下是测试代码：

function testTimeOver () {
var startTime = (new Date()).getTime();
for (var i = 1; i <= 15; i++) {
  Utilities.sleep(30100)
  var currTime = (new Date()).getTime();
  Logger.log(currTime - startTime);
  if( currTime - startTime > 300000 )
    {
      SpreadsheetApp.getActiveSpreadsheet().toast('test', 'test', 3);
      break;
    }  
  }
}

function testTimeUnder () {
var startTime = (new Date()).getTime();
for (var i = 1; i <= 30; i++) {
  Utilities.sleep(29100)
  var currTime = (new Date()).getTime();
  Logger.log(currTime - startTime);
  if( currTime - startTime > 290000 )
    {
      SpreadsheetApp.getActiveSpreadsheet().toast('test', 'test', 3);
      break;   
    }  
  }
 }

而testTimeUnder（）不：

[16-11-07 06:41:33:246 PST] SpreadsheetApp.getActiveSpreadsheet() [0 seconds]
[16-11-07 06:41:33:347 PST] Spreadsheet.toast([test, test, 3.0]) [0.1 seconds]
[16-11-07 06:41:33:349 PST] Execution succeeded [291.321 seconds total runtime]

---

300秒时发生了什么使服务不可用？

似乎已报告此问题：

---

似乎已报告了此问题：

[16-11-07 06:41:33:246 PST] SpreadsheetApp.getActiveSpreadsheet() [0 seconds]
[16-11-07 06:41:33:347 PST] Spreadsheet.toast([test, test, 3.0]) [0.1 seconds]
[16-11-07 06:41:33:349 PST] Execution succeeded [291.321 seconds total runtime]