Submitting this because I dont have the time (or resources) to debug this atm and need a self-reminder:
On Win32 walletpassphrase does not appear to relock after the designated amount of time as it should and as it does on Linux.
Can someone check this on OSX as well?

/**
 * A CWallet maintains a set of transactions and balances, and provides the ability to create new transactions.
 */
class CWallet final : public WalletStorage, public interfaces::Chain::Notifications
{
private:
    CKeyingMaterial vMasterKey GUARDED_BY(cs_wallet);
    bool Unlock(const CKeyingMaterial& vMasterKeyIn, bool accept_no_keys = false);
    std::atomic<bool> fAbortRescan{false};
    std::atomic<bool> fScanningWallet{false}; 
    std::atomic<int64_t> m_scanning_start{0};
    std::atomic<double> m_scanning_progress{0};
    friend class WalletRescanReserver;
    
    int nWalletVersion GUARDED_BY(cs_wallet){FEATURE_BASE};
    
    int64_t nNextResend = 0;
    /** Whether this wallet will submit newly created transactions to the node's mempool and
     * prompt rebroadcasts (see ResendWalletTransactions()). */
    bool fBroadcastTransactions = false;
    
    std::atomic<int64_t> m_best_block_time {0};
    /**
     * Used to keep track of spent outpoints, and
     * detect and report conflicts (double-spends or
     * mutated transactions where the mutant gets mined).
     */
    typedef std::multimap<COutPoint, uint256> TxSpends;
    TxSpends mapTxSpends GUARDED_BY(cs_wallet);
    void AddToSpends(const COutPoint& outpoint, const uint256& wtxid, WalletBatch* batch = nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);