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... the hardware is enclosed in a watertight casing, which can also cause high-temperatures inside when exposed to direct sunlight (which can be the case)... Maybe if I can find the 100% guarantee that the FPGA's contents do not change over time given the fact that power supply is not interrupted, I might be able to convince my manager that the verify option is not neccessary.
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Other than a hiccup from the kind of thing the automated SEU detection was meant for, the FPGA should operate reliably for an indefinite time as long as you do not exceed the allowed operating conditions given in the device handbook. If you are going to expose the device to high ambient temperatures or even to direct heating from sunlight, be careful that these external sources of heat in combination with the power dissipated internal to the device do not cause the junction temperature to exceed the specification limit.
FPGAs are successfully used in applications that require very long operating periods with extremely low failure rates.
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