Legal Question in Landlord & Tenant Law in Maryland

However much your lease says. Typically it is 24 hours, unless it's an emergency situation (a pipe burst, water leak, fire, break-in, etc). Sometimes leases say the landlord must give the tenant "reasonable" notice -- what's reasonable to the landlord may not be reasonable to you. I would recommend trying to play nice with the landlord -- it's the landlord's property, the landlord has the right to inspect it, and you can probably be evicted (it's likely a default under your lease to block access to the apartment) for failure to let him.

Best of luck.*****The above is for informational purposes only and does not create an attorney-client privilege.*****