Walking from the arriving AA gate to exit (arrivals level) will take around 4 - 5 mins.
Locating up escalator and going to departures level another 2 mins.
Walking around from AA terminal to International terminal will take around 15 - 20 mins.
I tend to walk fast so would do it in 20 mins but my other half tends to slow me down so 30 mins should easily do it.