I went from A to D today and it definitely took at least 20 minutes... I think some time should be added depending on how far down at the end of the terminal that you are. The occasional moving walkways help, but still a long haul if you're moving from three terminals apart.

Only other itme I'd mention is if arriving at a peak/connection time, often jets that arrive on time frustratingly await open gates from those that have not departed yet; would suck to miss connection after an "on-time" arrival because of this.

For international travel, personally I'd like to have a little more wiggle room - but that's just me.

Sincerely, - jdburns11