Gwinnett and Dekalb share a border and from some points you can walk between in less than 2 seconds :) but Dekalb county is between Gwinnett and Atlanta. From Lawrenceville it takes me around 20 minutes to get to spaghetti junction (just inside Dekalb County if I take I-85) or about 25 minutes to get to downtown Decatur if I use US78.
gwinnett and dekalb share a border, so 0 minute to 90 again
double for rush hour
[be more specific about locations - dekalb and gwinnett are big counties, even atlanta is a big place]]
wle
half an hour from Gwinnett county to atlanta.