Final answer:
In Illinois, the prescriptive period to acquire an easement or adverse possession is typically 20 years, involving continuous and adverse use of another person's land without permission.
Step-by-step explanation:
In Illinois (IL), the prescriptive period to acquire an easement by prescription or through adverse possession is typically 20 years. This means that a person must use the land of another openly, notoriously, continuously, and adversely without permission of the owner for a period of 20 years to claim an easement by prescription or to qualify for adverse possession. It is important to note that each case can be unique and there might be exceptions or specific circumstances that can affect the prescriptive period or the requirements necessary to establish these property rights.