Rental eviction is a legal process, not just a single action. The landlord may give a tenant 30 days to leave the premises because of nonpayment of rent, but the tenant can still raise the money and nullify that action. The tenant may also have an additional 30 days to appeal the reasons listed on the rental eviction form. A broken fence may get mended, or a noisy roommate may leave voluntarily. Again, the reason for the eviction may become a non-issue during an appeal.
Even if the landlord has given a 30 day eviction notice and the tenant has spent 30 more days appealing the decision, the eviction attempt may still end up in a local court. It could take 90 days from the first notice for anyone to be forced into doing anything. Once a law enforcement officer arrives with the final eviction notice, however, the tenant really has very few options left except to pack up and leave.