I've been a landlord for 15 years and this question pops up a lot.

Most leases indicate the landlord can access the property with 24 hours notice. 

We learn skills that most Landlords take decades to figure out through trial and error.Let us know if there's anything we can help with on your journey! 

Let's analyze each issue you've mentioned:1) Tenancy Length: besides issues a landlord can't control, like death, sickness, job loss, etc., the actual management of the property & tenant play a large roll in how long tenants stay in their home.

Simply be a calm stand off landlord who is expecting his tenants to honor the lease - Not you accommodate their personal situation.

Quote from @Tessa Tsui: Seeking advice from out of state landlords.

Take a look a look at the RPAWi. org, which is our local non-profit landlord association located in Milwaukee.

If you are a new landlord, your biggest problem may be your inability to set boundaries.

I see so many landlords lowing money through rookie mistakes, yet they continue looking for more doors.

It would be smart to do a full lease audit, estoppels issued, and tenant interviews.And if you are buying cash, there is nothing mandatory, since it is your money at risk. but again, physical condition inspections, understanding of tenants (they are a great source of information about issues with the property that the landlord may not know or may not disclose), surveys to understand accurate property lines, etc.