You are corect. This is easier done if you are making OT-style bucks and living below your means. By my calcs, at a 0% real return, it would take 45% of salary. At an average (real)return of 4%, it would take 30% of your salary. For returns of 7% and 10% (unrealistic in these times), it would take 23% and 16% respectively. Obviously, this is easier to do for someone making 200-300K than for someone making 100K. (Also, remember that company contributions to retirement reduce the savings requirement.)
However, the targets seem reasonable to me and the challenge is to try to make it happen. Personally, I'm sitting above target on savings, but carrying more debt than the guideline (primary residence mortgage only).
This post was edited on 9/14 at 8:40 am