Hey flyer!

1. It will require you to exit Int'A and re-enter security to reach T2. If you have TSA Pre, I'd say about 20 minutes? If not, then I'd probably make an allowance of about 30 - 40 minutes? It varies depending on the security queue and could easily be longer during busier times or if you're unlucky to go through when TSA is training a newbie x-ray operator.

2. Yes! T2 and Int'l G are connected airside! The stroll from T2 to the G gates is probably 15 min?

Assuming you disembark in Int'l A (preclearance), just exit and walk all the way down to hall and go through security at Int'G; then, just go down the escalator and make your way to T2.