Since the UD action is based on statute, the landlord has three years to file the action. However, to collect rent based on a 3 day notice, the action must be filed and served within one year. Delays are unusual, as the Landlord typically wishes to regain possession of the unit to re-rent it. You should not anticipate a lengthy delay. If the 3 day notice is invalid because your rent was current, or if the landlord refused to accept your rent payment tendered within the 3 day period, you can offer this evidence in defense of a UD action. If a UD action is filed, you may raise a retaliatory eviction defense provided your rent is current or the landlord has wrongfully refused your rent payment. What is not cleaer fro you questions is what you wish to achieve. Do you want to sta where you are. If not, you can reach a move-out agreement with the landlord.