The best answer is Weekly because maintenance scheduling discipline normally operates around a frozen weekly schedule. Planning identifies what work is ready; scheduling commits ready work to a time window, crew capacity, asset availability, parts, tools, and coordination with operations. If the schedule is locked daily, the organization usually stays reactive because work is constantly rearranged. If it is locked monthly, the schedule becomes too rigid for most operating environments and cannot realistically account for changing production windows, emergent risks, labor availability, or parts readiness. A weekly lock provides the correct balance: it protects planned work long enough to improve schedule compliance while still allowing controlled review for true emergencies. In CRL’s WEM domain, the purpose is not just creating work orders; it is executing reliability work predictably. Reliabilityweb’s WEM material emphasizes that many reliability and asset-management strategies fail at execution, and weekly schedule protection is a core execution-control practice. Industry scheduling guidance also describes a locked weekly schedule as standard practice.