Submitted by hals, also found by MiloTruck, HE1M, and Kow
https://github.com/ArbitrumFoundation/governance/blob/c18de53820c505fc459f766c1b224810eaeaabc5/src/security-council-mgmt/governors/SecurityCouncilMemberElectionGovernor.sol#L103-L110
https://github.com/ArbitrumFoundation/governance/blob/c18de53820c505fc459f766c1b224810eaeaabc5/src/security-council-mgmt/governors/modules/SecurityCouncilMemberElectionGovernorCountingUpgradeable.sol#L77-L84
Manual Testing & Foundry.
Enable setting a new value for fullWeightDuration only if theres no active election.
Governance
yahgwai (Arbitrum) confirmed and commented via duplicate issue #52:
