Less years, higher rates, large down payment requirements.
Everything is based on your financial situation, but for a 20-year loan on a starter chunk of property (~200k in Texas), probably looking at 20% down minimum @ 6-7% interest and about 1,200 monthly before taxes.
The interest rate goes way up the longer the amortization period (goes up much quicker than on a primary residence mortgage). I've found 10 years is the sweet spot for rate vs. affordability, but YMMV.
10 years at say 5% on a $200,000 property is still $1,700 monthly before taxes (after 20% down payment).
My rates may be off as I haven't been in the market lately. I'm sure one of our resident lenders can get you hooked up.