Even without a return call or TM from the guy, HER contacting him sets her withdrawal "clock" back to 0:00 each time she does it. Ditto each time she talks ABOUT him to her girlfriend.
WITHOUT these things, you can expect "hard withdrawal" (a near-depressive state) to last 2-4 weeks, and TOTAL withdrawal to last 3-12 months, depending on the depth of their emotional attachment.
