What is the average loan count one should take on?

[Corey Julian]

I am looking at purchasing my very first duplex(es) with in 90 days with a lofty goal of acquiring 20 units per year over the next five years and will re-evaluate after that. My wife and I are professional nurses and I’m retired and a disabled vet with a total annual income of over $400k. Would anyone suggest a limit on the number of loans I should acquire before attempting to maybe pay one or two off? Thanks for all of the insight. I love the forum.