Hit exception from "pyVpx/pyVim/task.py", line 121, in WaitForTask raise http.client.HTTPException: 408 Request Timeout

I'm triggering host enter maintenance mode API -> waitForTask via pyvmomi, this task would complete in 24 hour in VC since the heavy load, but watiForTask always fail in 8 hours with below exception

xxx/lib/vsphere/task.py", line 24, in waitTask
    WaitForTask(task)
  File "/usr/lib/python3.7/site-packages/pyVpx/pyVim/task.py", line 121, in WaitForTask
    version, state = GetTaskStatus(task, version, pc)
  File "/usr/lib/python3.7/site-packages/pyVpx/pyVim/task.py", line 244, in GetTaskStatus
    update = pc.WaitForUpdates(version)
  File "/usr/lib/python3.7/site-packages/pyVpx/pyVmomi/VmomiSupport.py", line 556, in <lambda>
    self.f(*(self.args + (obj,) + args), **kwargs)
  File "/usr/lib/python3.7/site-packages/pyVpx/pyVmomi/VmomiSupport.py", line 368, in _InvokeMethod
    return self._stub.InvokeMethod(self, info, args)
  File "/usr/lib/python3.7/site-packages/pyVpx/pyVmomi/SoapAdapter.py", line 1484, in InvokeMethod
    raise six.moves.http_client.HTTPException("%d %s" % (resp.status, resp.reason))
http.client.HTTPException: 408 Request Timeout

Could you help provide some insight about this issue and how to fix it? Thanks.

Start with pyVpx/pyVim/task.py at WaitForTask and GetTaskStatus, then trace the HTTPException raised by pyVmomi/SoapAdapter.py during pc.WaitForUpdates. Reproduce or characterize the eight-hour timeout for a maintenance-mode task; done would require a confirmed cause and an agreed fix, but the issue does not name a test or implementation target.