找到的答案：房客住一年以上的，month to month lease需要60天的notice：

The landlord’s required notice period will depend on how long the tenant has occupied the premises.

While the tenant must provide 30 days’ written notice to terminate a month-to-month tenancy, the landlord’s required notice period will depend on how long the tenant has occupied the premises. California Civil Code §1946.1 states that the landlord may terminate a month-to-month tenancy by providing 60 days’ written notice to the tenant. If the tenant has resided in the premises for less than one year (or Cal.Civ.Code §1946.1(d) applies regarding the sale of the premises), the landlord may terminate a month-to-month tenancy by providing 30 days’ written notice to Tenant.