They are usually 1-5 years . 5 years you get the best pricing and 1 year worst pricing .

The worst thing that you can say is I can't afford it.

Waiting 3 years for nearly 100k in “free” equity is to the worst thing.

I made so many mistakes that I decided to join a program to learn how to underwrite, due diligence, takeover, etc.I was lucky to find a great partner and we used seller carry back on our first deal.

A REI mistake I'm trying to recover from)This will be my actual 1st property. 

I made the mistake of listening to realtors who pushed me towards using Anderson 100 windows on a few for sale projects citing the name recognition will help sales.

I'm here to learn.That right there was your first mistake, you didn't do one, you blindly accepted what others told you. 

Quote from @Sendil Thangavelu: You are making a mistake by letting this tenant stay.

Worst case, they may count the interest plus principal payments of the repayment period as you said.  

Wondering what kind of numbers to conservatively budget for a worst case scenario?