Increase max try in llm benchmark

[kirklandsign]

10 x 30 (300s) might not be enough to get results.

[pytorch-bot]

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❌ 2 New Failures

As of commit edd791c with merge base f1ceb6c ():

NEW FAILURES - The following jobs have failed:

• Check Labels / Check labels (gh)
• Lint / lintrunner / linux-job (gh)
  >>> Lint for backends/cadence/hifi/operators/op_mm.cpp:

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