Even a 13 week break will not pass an audit. Face it, you are not a traveler anymore. Why should you get a tax break no one else gets? May I ask, do you even maintain a permanent residence you can return to at any time (it is not rented out or a relative's home)? This is required by the IRS to receive the tax break in the first place. You are supposed to be working away from home, not itinerant. You are also required to return home regularly (regularly is not well defined by the IRS). And if you really live there, have friends, relatives, church, doctors there, you will.
If you want the safest way as a traveler not to run afoul of the IRS (no matter what your agency allows), you have to look at working over one year in the same general area as a rolling timeline. If you have worked more than 12 months in the same general area during any 13 month period, you will see immediately that not even a break of 6 months in the middle of that period will be enough. It is safest to not work more than 12 months in any 24 month period in the same general area if you don't want to get slammed in an audit for back taxes, interest, and penalties.
The IRS is cracking down on the travel industry in general, so agencies are much more strict in the last couple of years about following rules. The problem is that the rules that get them past the IRS may not actually get a traveler through an audit. And it gets worse. Lots of recruiters coach traveler on how to fill out the housing questionnaire, saying things like just use your parents address as a permanent address and then we won't tax the housing, per diem, or travel reimbursement. It won't hurt the agency a bit if you lie, but it can hurt you.