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Maybe once or twice a year, depending on many things.
I recommend taking a leak rate (rate of rise test), after the furnace hot zone has been through a burn-out and cooled under vacuum, on a routine basis. This should be done maybe weekly or at least monthly and recorded. Eventually you will begin to see trends as the leak rate deteriorates. When the leak rate is determined to be to high, I would recommend a helium leak test using a mass spectrometer.