This read-create object, in seconds up to 10 million, sets how often the WEP encryption key rotates for this VLAN's non-unicast traffic, with 0 meaning key rotation is disabled entirely. An admin tunes this to balance the security benefit of frequent key changes against the overhead of rekeying clients. For example, an admin hardening an older WEP-based guest VLAN might set cwvlWlanNUcastKeyRotateInterval to a shorter interval to reduce the window during which any single key remains usable.